Opening Popup using IPopupService in v2 following documentation throws error

[imsam67]

I'm implementing popups using CommunityToolkit.Maui version 12 following Microsoft documentation at https://learn.microsoft.com/en-us/dotnet/communitytoolkit/maui/views/popup-service#presenting-a-popup

In the article, to open the popup, we use the following command which points to the view model for the popup:
this.popupService.ShowPopup<NamePopupViewModel>(Shell.Current);

If I do this, I get the following error:

System.Collections.Generic.KeyNotFoundException: 'The given key 'MauiApp1.MyPopupViewModel' was not present in the dictionary.'

If I use the actual popup ContentView instead of its view model, then it works fine.

Is this an error in the documentation or am I missing something here?

Here's a link to my public repo where you can see the code that throws the above mentioned error.
https://github.com/imsam67/maui-popup-service

[TheCodeTraveler]

You nust first register the popup with PopupService: https://learn.microsoft.com/dotnet/communitytoolkit/maui/views/popup-service:

builder.Services.AddTransientPopup<NamePopup, NamePopupViewModel>();

[bijington]

There is a very subtle difference between the documentation and your sample.

You are calling

builder.Services.AddTransient...

Where the documentation states you should be calling

builder.Services.AddTransientPopup...

[imsam67]

You're exactly right! I didn't see the Popup in AddTransientPopup..... Thank you for pointing that out. Really appreciate it!