how do i run it?

[fabpotato]

Total time: 1 mins 24.978 secs
silent-cartographer:password$ ./gradlew build
Picked up JAVA_TOOL_OPTIONS: -javaagent:/usr/share/java/jayatanaag.jar
:compileKotlin UP-TO-DATE
:compileJava UP-TO-DATE
:processResources UP-TO-DATE
:classes UP-TO-DATE
:jar UP-TO-DATE
:startScripts FAILED

FAILURE: Build failed with an exception.

• What went wrong:
  A problem was found with the configuration of task ':startScripts'.

No value has been specified for property 'mainClassName'.

• Try:
  Run with --info or --debug option to get more log output.

• Exception is:
  org.gradle.api.tasks.TaskValidationException: A problem was found with the configuration of task ':startScripts'.
  at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:55)
  at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:52)
  at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52)
  at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:53)
  at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)
  at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:208)
  at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:186)
  at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.processTask(AbstractTaskPlanExecutor.java:62)
  at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.run(AbstractTaskPlanExecutor.java:50)
  at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java:25)
  at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:111)
  at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:37)
  at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:62)
  at org.gradle.execution.DefaultBuildExecuter.access$200(DefaultBuildExecuter.java:23)
  at org.gradle.execution.DefaultBuildExecuter$2.proceed(DefaultBuildExecuter.java:68)
  at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32)
  at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:62)
  at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:55)
  at org.gradle.initialization.DefaultGradleLauncher$6.run(DefaultGradleLauncher.java:174)
  at org.gradle.internal.Factories$1.create(Factories.java:22)
  at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:62)
  at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:47)
  at org.gradle.initialization.DefaultGradleLauncher.runBuildOperation(DefaultGradleLauncher.java:189)
  at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:171)
  at org.gradle.initialization.DefaultGradleLauncher.access$200(DefaultGradleLauncher.java:35)
  at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:104)
  at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:97)
  at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:62)
  at org.gradle.initialization.DefaultGradleLauncher.runRootBuildOperation(DefaultGradleLauncher.java:184)
  at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:97)
  at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:86)
  at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessBuildActionExecuter.java:93)
  at org.gradle.tooling.internal.provider.ExecuteBuildActionRunner.run(ExecuteBuildActionRunner.java:28)
  at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35)
  at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:43)
  at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:27)
  at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:72)
  at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:44)
  at org.gradle.launcher.exec.DaemonUsageSuggestingBuildActionExecuter.execute(DaemonUsageSuggestingBuildActionExecuter.java:50)
  at org.gradle.launcher.exec.DaemonUsageSuggestingBuildActionExecuter.execute(DaemonUsageSuggestingBuildActionExecuter.java:27)
  at org.gradle.launcher.cli.RunBuildAction.run(RunBuildAction.java:40)
  at org.gradle.internal.Actions$RunnableActionAdapter.execute(Actions.java:170)
  at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:237)
  at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:210)
  at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:35)
  at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:24)
  at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:206)
  at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:169)
  at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:33)
  at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:22)
  at org.gradle.launcher.Main.doAction(Main.java:33)
  at org.gradle.launcher.bootstrap.EntryPoint.run(EntryPoint.java:45)
  at org.gradle.launcher.bootstrap.ProcessBootstrap.runNoExit(ProcessBootstrap.java:54)
  at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:35)
  at org.gradle.launcher.GradleMain.main(GradleMain.java:23)
  at org.gradle.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java:30)
  at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:127)
  at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:61)
  Caused by: org.gradle.api.InvalidUserDataException: No value has been specified for property 'mainClassName'.
  at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:47)
  ... 57 more

BUILD FAILED