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For Unity2018 project, Failed to load project file #8426

@DFVSQY

Description

@DFVSQY

Environment data

dotnet --info output:

.NET SDK:
 Version:           8.0.412
 Commit:            819e1a9566
 Workload version:  8.0.400-manifests.9cf71931
 MSBuild version:   17.11.31+933b72e36

运行时环境:
 OS Name:     Windows
 OS Version:  10.0.26100
 OS Platform: Windows
 RID:         win-x64
 Base Path:   C:\Program Files\dotnet\sdk\8.0.412\

已安装 .NET 工作负载:
配置为在安装新清单时使用 loose manifests。
没有要显示的已安装工作负载。

Host:
  Version:      8.0.18
  Architecture: x64
  Commit:       ef853a7105

.NET SDKs installed:
  8.0.412 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 8.0.18 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 8.0.18 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 8.0.18 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Other architectures found:
  None

Environment variables:
  Not set

global.json file:
  Not found

Learn more:
  https://aka.ms/dotnet/info

Download .NET:
  https://aka.ms/dotnet/download

VS Code version:

Version: 1.102.0 (system setup)
Commit: cb0c47c0cfaad0757385834bd89d410c78a856c0
Date: 2025-07-09T22:10:34.600Z
Electron: 35.6.0
ElectronBuildId: 11847422
Chromium: 134.0.6998.205
Node.js: 22.15.1
V8: 13.4.114.21-electron.0
OS: Windows_NT x64 10.0.26100

C# Extension version:

Name: C#
Id: ms-dotnettools.csharp
Description: Base language support for C#
Version: 2.84.19
Publisher: Microsoft
VS Marketplace Link: https://marketplace.visualstudio.com/items?itemName=ms-dotnettools.csharp

C# logs

Omnisharp Log output window contents:

Starting OmniSharp server at 7/17/2025, 10:27:23 AM
    Target: g:\MN02\trunk\matrix\client\client.sln

OmniSharp server started.
    Path: c:\Users\Tengzhaoju\.vscode\extensions\ms-dotnettools.csharp-2.84.19-win32-x64\.omnisharp\1.39.12\OmniSharp.exe
    PID: 19680

[trce]: OmniSharp.Services.AssemblyLoader
        Assembly loaded: OmniSharp.Cake
[dbug]: OmniSharp.CompositionHostBuilder
        Loaded OmniSharp.Cake, Version=1.39.0.0, Culture=neutral, PublicKeyToken=7e5bf7b3b470b509
[trce]: OmniSharp.Services.AssemblyLoader
        Assembly loaded: OmniSharp.DotNetTest
[dbug]: OmniSharp.CompositionHostBuilder
        Loaded OmniSharp.DotNetTest, Version=1.39.0.0, Culture=neutral, PublicKeyToken=7e5bf7b3b470b509
[trce]: OmniSharp.Services.AssemblyLoader
        Assembly loaded: OmniSharp.Host
[dbug]: OmniSharp.CompositionHostBuilder
        Loaded OmniSharp.Host, Version=1.39.0.0, Culture=neutral, PublicKeyToken=7e5bf7b3b470b509
[trce]: OmniSharp.Services.AssemblyLoader
        Assembly loaded: OmniSharp.MSBuild
[dbug]: OmniSharp.CompositionHostBuilder
        Loaded OmniSharp.MSBuild, Version=1.39.0.0, Culture=neutral, PublicKeyToken=7e5bf7b3b470b509
[trce]: OmniSharp.Services.AssemblyLoader
        Assembly loaded: OmniSharp.Roslyn
[dbug]: OmniSharp.CompositionHostBuilder
        Loaded OmniSharp.Roslyn, Version=1.39.0.0, Culture=neutral, PublicKeyToken=7e5bf7b3b470b509
[trce]: OmniSharp.Services.AssemblyLoader
        Assembly loaded: OmniSharp.Roslyn.CSharp
[dbug]: OmniSharp.CompositionHostBuilder
        Loaded OmniSharp.Roslyn.CSharp, Version=1.39.0.0, Culture=neutral, PublicKeyToken=7e5bf7b3b470b509
[trce]: OmniSharp.Services.AssemblyLoader
        Assembly loaded: OmniSharp.Script
[dbug]: OmniSharp.CompositionHostBuilder
        Loaded OmniSharp.Script, Version=1.39.0.0, Culture=neutral, PublicKeyToken=7e5bf7b3b470b509
[trce]: OmniSharp.Services.AssemblyLoader
        Assembly loaded: OmniSharp.Shared
[dbug]: OmniSharp.CompositionHostBuilder
        Loaded OmniSharp.Shared, Version=1.39.0.0, Culture=neutral, PublicKeyToken=7e5bf7b3b470b509
[trce]: OmniSharp.Services.AssemblyLoader
        Assembly loaded from path: c:\Users\Tengzhaoju\.vscode\extensions\ms-dotnettools.csharp-2.84.19-win32-x64\.razoromnisharp\OmniSharpPlugin\Microsoft.AspNetCore.Razor.OmniSharpPlugin.dll
[info]: OmniSharp.Stdio.Host
        Starting OmniSharp on Windows 6.2.9200.0 (x64)
[info]: OmniSharp.Services.DotNetCliService
        Checking the 'DOTNET_ROOT' environment variable to find a .NET SDK
[info]: OmniSharp.Services.DotNetCliService
        Using the 'dotnet' on the PATH.
[info]: OmniSharp.Services.DotNetCliService
        DotNetPath set to dotnet
[dbug]: OmniSharp.CompositionHostBuilder
        .NET SDK requires MSBuild instances version 16.3 or higher
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
        Located 1 MSBuild instance(s)
            1: Visual Studio Professional 2022 17.14.36310.24 17.14.14 - "C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild\Current\Bin"
[dbug]: OmniSharp.CompositionHostBuilder
        MSBuild instance Visual Studio Professional 2022 17.14.36310.24 17.14.14 scored at -2147483648
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
        Registered MSBuild instance: Visual Studio Professional 2022 17.14.36310.24 17.14.14 - "C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild\Current\Bin"
[trce]: OmniSharp.Services.AssemblyLoader
        Assembly loaded: Microsoft.CodeAnalysis.Features, Version=4.12.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
[trce]: OmniSharp.Services.AssemblyLoader
        Assembly loaded: Microsoft.CodeAnalysis.CSharp.Features, Version=4.12.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
[trce]: OmniSharp.Services.AssemblyLoader
        Assembly loaded: Microsoft.CodeAnalysis.ExternalAccess.OmniSharp, Version=4.12.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
[trce]: OmniSharp.Services.AssemblyLoader
        Assembly loaded: Microsoft.CodeAnalysis.ExternalAccess.OmniSharp.CSharp, Version=4.12.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
[trce]: OmniSharp.HostServicesAggregator
        Successfully added Microsoft.CodeAnalysis.Features, Version=4.12.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 to host service assemblies.
[trce]: OmniSharp.HostServicesAggregator
        Successfully added Microsoft.CodeAnalysis.CSharp.Features, Version=4.12.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 to host service assemblies.
[trce]: OmniSharp.HostServicesAggregator
        Successfully added Microsoft.CodeAnalysis.ExternalAccess.OmniSharp, Version=4.12.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 to host service assemblies.
[trce]: OmniSharp.HostServicesAggregator
        Successfully added Microsoft.CodeAnalysis.ExternalAccess.OmniSharp.CSharp, Version=4.12.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 to host service assemblies.
[dbug]: OmniSharp.WorkspaceInitializer
        Starting with OmniSharp options: {"RoslynExtensionsOptions":{"EnableDecompilationSupport":true,"EnableAnalyzersSupport":true,"EnableImportCompletion":true,"EnableAsyncCompletion":false,"DocumentAnalysisTimeoutMs":30000,"DiagnosticWorkersThreadCount":9,"AnalyzeOpenDocumentsOnly":true,"InlayHintsOptions":{"EnableForParameters":false,"ForLiteralParameters":false,"ForIndexerParameters":false,"ForObjectCreationParameters":false,"ForOtherParameters":false,"SuppressForParametersThatDifferOnlyBySuffix":false,"SuppressForParametersThatMatchMethodIntent":false,"SuppressForParametersThatMatchArgumentName":false,"EnableForTypes":false,"ForImplicitVariableTypes":false,"ForLambdaParameterTypes":false,"ForImplicitObjectCreation":false},"LocationPaths":null},"FormattingOptions":{"OrganizeImports":false,"EnableEditorConfigSupport":true,"NewLine":"\n","UseTabs":true,"TabSize":4,"IndentationSize":4,"SpacingAfterMethodDeclarationName":false,"SeparateImportDirectiveGroups":false,"SpaceWithinMethodDeclarationParenthesis":false,"SpaceBetweenEmptyMethodDeclarationParentheses":false,"SpaceAfterMethodCallName":false,"SpaceWithinMethodCallParentheses":false,"SpaceBetweenEmptyMethodCallParentheses":false,"SpaceAfterControlFlowStatementKeyword":true,"SpaceWithinExpressionParentheses":false,"SpaceWithinCastParentheses":false,"SpaceWithinOtherParentheses":false,"SpaceAfterCast":false,"SpaceBeforeOpenSquareBracket":false,"SpaceBetweenEmptySquareBrackets":false,"SpaceWithinSquareBrackets":false,"SpaceAfterColonInBaseTypeDeclaration":true,"SpaceAfterComma":true,"SpaceAfterDot":false,"SpaceAfterSemicolonsInForStatement":true,"SpaceBeforeColonInBaseTypeDeclaration":true,"SpaceBeforeComma":false,"SpaceBeforeDot":false,"SpaceBeforeSemicolonsInForStatement":false,"SpacingAroundBinaryOperator":"single","IndentBraces":false,"IndentBlock":true,"IndentSwitchSection":true,"IndentSwitchCaseSection":true,"IndentSwitchCaseSectionWhenBlock":true,"LabelPositioning":"oneLess","WrappingPreserveSingleLine":true,"WrappingKeepStatementsOnSingleLine":true,"NewLinesForBracesInTypes":true,"NewLinesForBracesInMethods":true,"NewLinesForBracesInProperties":true,"NewLinesForBracesInAccessors":true,"NewLinesForBracesInAnonymousMethods":true,"NewLinesForBracesInControlBlocks":true,"NewLinesForBracesInAnonymousTypes":true,"NewLinesForBracesInObjectCollectionArrayInitializers":true,"NewLinesForBracesInLambdaExpressionBody":true,"NewLineForElse":true,"NewLineForCatch":true,"NewLineForFinally":true,"NewLineForMembersInObjectInit":true,"NewLineForMembersInAnonymousTypes":true,"NewLineForClausesInQuery":true},"FileOptions":{"SystemExcludeSearchPatterns":["**/node_modules/**/*","**/bin/**/*","**/obj/**/*","**/.git/**/*","**/.git","**/.svn","**/.hg","**/.DS_Store","**/Thumbs.db","**/.gitignore","**/.gitmodules","**/*.booproj","**/*.pidb","**/*.suo","**/*.user","**/*.userprefs","**/*.unityproj","**/*.mp3","**/*.mp4","**/*.dll","**/*.exe","**/*.pdf","**/*.mid","**/*.midi","**/*.wav","**/*.gif","**/*.ico","**/*.jpg","**/*.jpeg","**/*.png","**/*.psd","**/*.tga","**/*.tif","**/*.tiff","**/*.3ds","**/*.3DS","**/*.fbx","**/*.FBX","**/*.lxo","**/*.LXO","**/*.ma","**/*.MA","**/*.obj","**/*.OBJ","**/*.asset","**/*.cubemap","**/*.flare","**/*.mat","**/*.meta","**/*.prefab","**/*.unity","**/*.lua.bytes","**/*.skel.bytes","**/*.gif.bytes","build/","Build/","Library/","library/","obj/","Obj/","ProjectSettings/","temp/","Temp/","Assets/.lpproj","streamingassets/"],"ExcludeSearchPatterns":[]},"RenameOptions":{"RenameOverloads":false,"RenameInStrings":false,"RenameInComments":false},"ImplementTypeOptions":{"InsertionBehavior":0,"PropertyGenerationBehavior":0},"DotNetCliOptions":{"LocationPaths":null},"Plugins":{"LocationPaths":null}}
[info]: OmniSharp.WorkspaceInitializer
        Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.CSharpFormattingWorkspaceOptionsProvider, Order: 0
[info]: OmniSharp.Cake.CakeProjectSystem
        Detecting Cake files in 'g:\MN02\trunk\matrix\client\'.
[info]: OmniSharp.Cake.CakeProjectSystem
        Did not find any Cake files
[dbug]: OmniSharp.MSBuild.ProjectSystem
        MSBuild environment: 
Mode: VisualStudio
RunningTests: False
RunningInVisualStudio: False
MSBuildToolsDirectory32: C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild\Current\Bin
MSBuildToolsDirectory64: C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild\Current\Bin\amd64
MSBuildSDKsPath: C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild\Sdks
CurrentMSBuildConfigurationFile: C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild\Current\Bin\amd64\MSBuild.exe.config
CurrentMSBuildExePath: C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild\Current\Bin\amd64\MSBuild.exe
CurrentMSBuildToolsDirectory: C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild\Current\Bin\amd64
VisualStudioInstallRootDirectory: C:\Program Files\Microsoft Visual Studio\2022\Professional
MSBuildExtensionsPath: C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild

[info]: OmniSharp.MSBuild.ProjectSystem
        Detecting projects in 'g:\MN02\trunk\matrix\client\client.sln'.
[dbug]: OmniSharp.MSBuild.ProjectSystem
        Parsing ProjectConfigurationPlatforms of 'g:\MN02\trunk\matrix\client\client.sln'.
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'g:\MN02\trunk\matrix\client\spine-csharp.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'g:\MN02\trunk\matrix\client\Assembly-CSharp.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'g:\MN02\trunk\matrix\client\spine-timeline.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'g:\MN02\trunk\matrix\client\Google.Play.AssetDelivery.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'g:\MN02\trunk\matrix\client\spine-unity.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'g:\MN02\trunk\matrix\client\Assembly-CSharp-firstpass.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'g:\MN02\trunk\matrix\client\Google.Play.Common.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'g:\MN02\trunk\matrix\client\Sirenix.OdinInspector.CompatibilityLayer.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'g:\MN02\trunk\matrix\client\Google.Play.Core.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'g:\MN02\trunk\matrix\client\spine-unity-editor.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'g:\MN02\trunk\matrix\client\Assembly-CSharp-Editor.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'g:\MN02\trunk\matrix\client\Google.Android.AppBundle.Editor.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'g:\MN02\trunk\matrix\client\GTCommonExtent.Editor.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'g:\MN02\trunk\matrix\client\Sirenix.OdinInspector.CompatibilityLayer.Editor.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'g:\MN02\trunk\matrix\client\spine-timeline-editor.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'g:\MN02\trunk\matrix\client\Assembly-CSharp-Editor-firstpass.csproj'
[info]: OmniSharp.Script.ScriptProjectSystem
        Detecting CSX files in 'g:\MN02\trunk\matrix\client\'.
[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: g:\MN02\trunk\matrix\client\spine-csharp.csproj
[warn]: OmniSharp.MSBuild.ProjectManager
        Failed to load project file 'g:\MN02\trunk\matrix\client\spine-csharp.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: g:\MN02\trunk\matrix\client\Assembly-CSharp.csproj
[warn]: OmniSharp.MSBuild.ProjectManager
        Failed to load project file 'g:\MN02\trunk\matrix\client\Assembly-CSharp.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: g:\MN02\trunk\matrix\client\spine-timeline.csproj
[warn]: OmniSharp.MSBuild.ProjectManager
        Failed to load project file 'g:\MN02\trunk\matrix\client\spine-timeline.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: g:\MN02\trunk\matrix\client\Google.Play.AssetDelivery.csproj
[warn]: OmniSharp.MSBuild.ProjectManager
        Failed to load project file 'g:\MN02\trunk\matrix\client\Google.Play.AssetDelivery.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: g:\MN02\trunk\matrix\client\spine-unity.csproj
[warn]: OmniSharp.MSBuild.ProjectManager
        Failed to load project file 'g:\MN02\trunk\matrix\client\spine-unity.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: g:\MN02\trunk\matrix\client\Assembly-CSharp-firstpass.csproj
[info]: OmniSharp.Script.ScriptProjectSystem
        Did not find any CSX files
[info]: OmniSharp.WorkspaceInitializer
        Configuration finished.
[info]: OmniSharp.Stdio.Host
        Omnisharp server running using Stdio at location 'g:\MN02\trunk\matrix\client\' on host 5308.
[dbug]: OmniSharp.Stdio.Host
        ************ Request ************
{
  "Type": "request",
  "Seq": 52,
  "Command": "/projects"
}
[dbug]: OmniSharp.Stdio.Host
        ************ Request ************
{
  "Type": "request",
  "Seq": 53,
  "Command": "/projects"
}
[warn]: OmniSharp.MSBuild.ProjectManager
        Failed to load project file 'g:\MN02\trunk\matrix\client\Assembly-CSharp-firstpass.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: g:\MN02\trunk\matrix\client\Google.Play.Common.csproj
[warn]: OmniSharp.MSBuild.ProjectManager
        Failed to load project file 'g:\MN02\trunk\matrix\client\Google.Play.Common.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: g:\MN02\trunk\matrix\client\Sirenix.OdinInspector.CompatibilityLayer.csproj
[warn]: OmniSharp.MSBuild.ProjectManager
        Failed to load project file 'g:\MN02\trunk\matrix\client\Sirenix.OdinInspector.CompatibilityLayer.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: g:\MN02\trunk\matrix\client\Google.Play.Core.csproj
[warn]: OmniSharp.MSBuild.ProjectManager
        Failed to load project file 'g:\MN02\trunk\matrix\client\Google.Play.Core.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: g:\MN02\trunk\matrix\client\spine-unity-editor.csproj
[warn]: OmniSharp.MSBuild.ProjectManager
        Failed to load project file 'g:\MN02\trunk\matrix\client\spine-unity-editor.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: g:\MN02\trunk\matrix\client\Assembly-CSharp-Editor.csproj
[warn]: OmniSharp.MSBuild.ProjectManager
        Failed to load project file 'g:\MN02\trunk\matrix\client\Assembly-CSharp-Editor.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: g:\MN02\trunk\matrix\client\Google.Android.AppBundle.Editor.csproj
[warn]: OmniSharp.MSBuild.ProjectManager
        Failed to load project file 'g:\MN02\trunk\matrix\client\Google.Android.AppBundle.Editor.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: g:\MN02\trunk\matrix\client\GTCommonExtent.Editor.csproj
[warn]: OmniSharp.MSBuild.ProjectManager
        Failed to load project file 'g:\MN02\trunk\matrix\client\GTCommonExtent.Editor.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: g:\MN02\trunk\matrix\client\Sirenix.OdinInspector.CompatibilityLayer.Editor.csproj
[warn]: OmniSharp.MSBuild.ProjectManager
        Failed to load project file 'g:\MN02\trunk\matrix\client\Sirenix.OdinInspector.CompatibilityLayer.Editor.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: g:\MN02\trunk\matrix\client\spine-timeline-editor.csproj
[warn]: OmniSharp.MSBuild.ProjectManager
        Failed to load project file 'g:\MN02\trunk\matrix\client\spine-timeline-editor.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: g:\MN02\trunk\matrix\client\Assembly-CSharp-Editor-firstpass.csproj
[warn]: OmniSharp.MSBuild.ProjectManager
        Failed to load project file 'g:\MN02\trunk\matrix\client\Assembly-CSharp-Editor-firstpass.csproj'.
[fail]: OmniSharp.MSBuild.ProjectManager
        Attempted to update project that is not loaded: g:\MN02\trunk\matrix\client\spine-csharp.csproj
[fail]: OmniSharp.MSBuild.ProjectManager
        Attempted to update project that is not loaded: g:\MN02\trunk\matrix\client\Assembly-CSharp.csproj
[fail]: OmniSharp.MSBuild.ProjectManager
        Attempted to update project that is not loaded: g:\MN02\trunk\matrix\client\spine-timeline.csproj
[fail]: OmniSharp.MSBuild.ProjectManager
        Attempted to update project that is not loaded: g:\MN02\trunk\matrix\client\Google.Play.AssetDelivery.csproj
[fail]: OmniSharp.MSBuild.ProjectManager
        Attempted to update project that is not loaded: g:\MN02\trunk\matrix\client\spine-unity.csproj
[fail]: OmniSharp.MSBuild.ProjectManager
        Attempted to update project that is not loaded: g:\MN02\trunk\matrix\client\Assembly-CSharp-firstpass.csproj
[fail]: OmniSharp.MSBuild.ProjectManager
        Attempted to update project that is not loaded: g:\MN02\trunk\matrix\client\Google.Play.Common.csproj
[fail]: OmniSharp.MSBuild.ProjectManager
        Attempted to update project that is not loaded: g:\MN02\trunk\matrix\client\Sirenix.OdinInspector.CompatibilityLayer.csproj
[fail]: OmniSharp.MSBuild.ProjectManager
        Attempted to update project that is not loaded: g:\MN02\trunk\matrix\client\Google.Play.Core.csproj
[fail]: OmniSharp.MSBuild.ProjectManager
        Attempted to update project that is not loaded: g:\MN02\trunk\matrix\client\spine-unity-editor.csproj
[fail]: OmniSharp.MSBuild.ProjectManager
        Attempted to update project that is not loaded: g:\MN02\trunk\matrix\client\Assembly-CSharp-Editor.csproj
[fail]: OmniSharp.MSBuild.ProjectManager
        Attempted to update project that is not loaded: g:\MN02\trunk\matrix\client\Google.Android.AppBundle.Editor.csproj
[fail]: OmniSharp.MSBuild.ProjectManager
        Attempted to update project that is not loaded: g:\MN02\trunk\matrix\client\GTCommonExtent.Editor.csproj
[fail]: OmniSharp.MSBuild.ProjectManager
        Attempted to update project that is not loaded: g:\MN02\trunk\matrix\client\Sirenix.OdinInspector.CompatibilityLayer.Editor.csproj
[fail]: OmniSharp.MSBuild.ProjectManager
        Attempted to update project that is not loaded: g:\MN02\trunk\matrix\client\spine-timeline-editor.csproj
[fail]: OmniSharp.MSBuild.ProjectManager
        Attempted to update project that is not loaded: g:\MN02\trunk\matrix\client\Assembly-CSharp-Editor-firstpass.csproj
[dbug]: OmniSharp.Stdio.Host
        ************  Response (573.8692ms) ************ 
{
  "Request_seq": 52,
  "Command": "/projects",
  "Running": true,
  "Success": true,
  "Message": null,
  "Body": {
    "MsBuild": {
      "SolutionPath": "g:\\MN02\\trunk\\matrix\\client\\client.sln",
      "Projects": []
    },
    "Script": {
      "Projects": []
    }
  },
  "Seq": 80,
  "Type": "response"
}
[dbug]: OmniSharp.Stdio.Host
        ************  Response (574.3197ms) ************ 
{
  "Request_seq": 53,
  "Command": "/projects",
  "Running": true,
  "Success": true,
  "Message": null,
  "Body": {
    "MsBuild": {
      "SolutionPath": "g:\\MN02\\trunk\\matrix\\client\\client.sln",
      "Projects": []
    },
    "Script": {
      "Projects": []
    }
  },
  "Seq": 81,
  "Type": "response"
}
[dbug]: OmniSharp.Stdio.Host
        ************ Request ************
{
  "Type": "request",
  "Seq": 54,
  "Command": "/projects"
}
[dbug]: OmniSharp.Stdio.Host
        ************  Response (0.1398ms) ************ 
{
  "Request_seq": 54,
  "Command": "/projects",
  "Running": true,
  "Success": true,
  "Message": null,
  "Body": {
    "MsBuild": {
      "SolutionPath": "g:\\MN02\\trunk\\matrix\\client\\client.sln",
      "Projects": []
    },
    "Script": {
      "Projects": []
    }
  },
  "Seq": 133,
  "Type": "response"
}
[dbug]: OmniSharp.Stdio.Host
        ************ Request ************
{
  "Type": "request",
  "Seq": 55,
  "Command": "/projects"
}
[dbug]: OmniSharp.Stdio.Host
        ************ Request ************
{
  "Type": "request",
  "Seq": 56,
  "Command": "/projects"
}
[dbug]: OmniSharp.Stdio.Host
        ************  Response (0.1446ms) ************ 
{
  "Request_seq": 55,
  "Command": "/projects",
  "Running": true,
  "Success": true,
  "Message": null,
  "Body": {
    "MsBuild": {
      "SolutionPath": "g:\\MN02\\trunk\\matrix\\client\\client.sln",
      "Projects": []
    },
    "Script": {
      "Projects": []
    }
  },
  "Seq": 137,
  "Type": "response"
}
[dbug]: OmniSharp.Stdio.Host
        ************  Response (0.1442ms) ************ 
{
  "Request_seq": 56,
  "Command": "/projects",
  "Running": true,
  "Success": true,
  "Message": null,
  "Body": {
    "MsBuild": {
      "SolutionPath": "g:\\MN02\\trunk\\matrix\\client\\client.sln",
      "Projects": []
    },
    "Script": {
      "Projects": []
    }
  },
  "Seq": 138,
  "Type": "response"
}
[dbug]: OmniSharp.Stdio.Host
        ************ Request ************
{
  "Type": "request",
  "Seq": 57,
  "Command": "/projects"
}
[dbug]: OmniSharp.Stdio.Host
        ************  Response (0.1240ms) ************ 
{
  "Request_seq": 57,
  "Command": "/projects",
  "Running": true,
  "Success": true,
  "Message": null,
  "Body": {
    "MsBuild": {
      "SolutionPath": "g:\\MN02\\trunk\\matrix\\client\\client.sln",
      "Projects": []
    },
    "Script": {
      "Projects": []
    }
  },
  "Seq": 142,
  "Type": "response"
}
[dbug]: OmniSharp.Stdio.Host
        ************ Request ************
{
  "Type": "request",
  "Seq": 58,
  "Command": "/projects"
}
[dbug]: OmniSharp.Stdio.Host
        ************ Request ************
{
  "Type": "request",
  "Seq": 59,
  "Command": "/projects"
}
[dbug]: OmniSharp.Stdio.Host
        ************  Response (0.1077ms) ************ 
{
  "Request_seq": 58,
  "Command": "/projects",
  "Running": true,
  "Success": true,
  "Message": null,
  "Body": {
    "MsBuild": {
      "SolutionPath": "g:\\MN02\\trunk\\matrix\\client\\client.sln",
      "Projects": []
    },
    "Script": {
      "Projects": []
    }
  },
  "Seq": 145,
  "Type": "response"
}
[dbug]: OmniSharp.Stdio.Host
        ************  Response (0.1070ms) ************ 
{
  "Request_seq": 59,
  "Command": "/projects",
  "Running": true,
  "Success": true,
  "Message": null,
  "Body": {
    "MsBuild": {
      "SolutionPath": "g:\\MN02\\trunk\\matrix\\client\\client.sln",
      "Projects": []
    },
    "Script": {
      "Projects": []
    }
  },
  "Seq": 147,
  "Type": "response"
}
[dbug]: OmniSharp.Stdio.Host
        ************ Request ************
{
  "Type": "request",
  "Seq": 60,
  "Command": "/projects"
}
[dbug]: OmniSharp.Stdio.Host
        ************  Response (0.1053ms) ************ 
{
  "Request_seq": 60,
  "Command": "/projects",
  "Running": true,
  "Success": true,
  "Message": null,
  "Body": {
    "MsBuild": {
      "SolutionPath": "g:\\MN02\\trunk\\matrix\\client\\client.sln",
      "Projects": []
    },
    "Script": {
      "Projects": []
    }
  },
  "Seq": 151,
  "Type": "response"
}
[dbug]: OmniSharp.Stdio.Host
        ************ Request ************
{
  "Type": "request",
  "Seq": 61,
  "Command": "/projects"
}
[dbug]: OmniSharp.Stdio.Host
        ************ Request ************
{
  "Type": "request",
  "Seq": 62,
  "Command": "/projects"
}
[dbug]: OmniSharp.Stdio.Host
        ************  Response (0.0860ms) ************ 
{
  "Request_seq": 62,
  "Command": "/projects",
  "Running": true,
  "Success": true,
  "Message": null,
  "Body": {
    "MsBuild": {
      "SolutionPath": "g:\\MN02\\trunk\\matrix\\client\\client.sln",
      "Projects": []
    },
    "Script": {
      "Projects": []
    }
  },
  "Seq": 156,
  "Type": "response"
}
[dbug]: OmniSharp.Stdio.Host
        ************  Response (0.0966ms) ************ 
{
  "Request_seq": 61,
  "Command": "/projects",
  "Running": true,
  "Success": true,
  "Message": null,
  "Body": {
    "MsBuild": {
      "SolutionPath": "g:\\MN02\\trunk\\matrix\\client\\client.sln",
      "Projects": []
    },
    "Script": {
      "Projects": []
    }
  },
  "Seq": 154,
  "Type": "response"
}
[dbug]: OmniSharp.Stdio.Host
        ************ Request ************
{
  "Type": "request",
  "Seq": 63,
  "Command": "/projects"
}
[dbug]: OmniSharp.Stdio.Host
        ************  Response (0.0908ms) ************ 
{
  "Request_seq": 63,
  "Command": "/projects",
  "Running": true,
  "Success": true,
  "Message": null,
  "Body": {
    "MsBuild": {
      "SolutionPath": "g:\\MN02\\trunk\\matrix\\client\\client.sln",
      "Projects": []
    },
    "Script": {
      "Projects": []
    }
  },
  "Seq": 160,
  "Type": "response"
}

See this page for collecting more detailed logs

Problem

I have been using VS Code with the C# plugin (without installing the C# Dev Kit plugin) to open my Unity game project (Unity 2018.4.32f1 version) on the Windows platform. Everything was working fine originally, but after updating Visual Studio 2022 to a minor version, I can no longer successfully load the Unity project in VS Code. I have tried many methods, such as downgrading the .NET version, but none of them worked.

My Omnisharp configuration options are as follows:

"dotnet.defaultSolution": "g:\\MN02\\trunk\\matrix\\client\\client.sln",
"dotnet.server.useOmnisharp": true,
"omnisharp.loggingLevel": "trace",
"omnisharp.useModernNet": false

I rely heavily on this development environment and am urgently requesting assistance.

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