StreamJsonRpc.RemoteInvocationException: Unable to cast object of type 'FinalState' to type 'InProgressState'.

[mavasani]

VS version: Microsoft Visual Studio Enterprise 2019 Int Preview Version 16.9.0 Preview 2.0 [30709.18.main]

Don't have repro steps - just saw bunch of gold bars pop up while typing:

StreamJsonRpc.RemoteInvocationException: Unable to cast object of type 'FinalState' to type 'InProgressState'.
   at StreamJsonRpc.JsonRpc.<InvokeCoreAsync>d__134`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Threading.Tasks.ValueTask`1.get_Result()
   at Microsoft.CodeAnalysis.Remote.BrokeredServiceConnection`1.<TryInvokeAsync>d__17`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject)
RPC server exception:
System.InvalidCastException: Unable to cast object of type 'FinalState' to type 'InProgressState'.
      at Microsoft.CodeAnalysis.SolutionState.CompilationTracker.<GetOrBuildDeclarationCompilationAsync>d__22.MoveNext()
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject)
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
      at Microsoft.CodeAnalysis.SolutionState.CompilationTracker.<GetMetadataOnlyImageReferenceAsync>d__35.MoveNext()
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
      at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()
      at Microsoft.CodeAnalysis.SolutionState.CompilationTracker.<GetMetadataReferenceAsync>d__33.MoveNext()
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at Microsoft.CodeAnalysis.SolutionState.CompilationTracker.<FinalizeCompilationAsync>d__31.MoveNext()
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
      at Microsoft.CodeAnalysis.SolutionState.CompilationTracker.<GetOrBuildCompilationInfoAsync>d__23.MoveNext()
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
      at Microsoft.CodeAnalysis.SolutionState.CompilationTracker.<GetCompilationSlowAsync>d__20.MoveNext()
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
      at Microsoft.CodeAnalysis.Document.<GetSemanticModelAsync>d__23.MoveNext()
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
      at Microsoft.CodeAnalysis.DocumentHighlighting.AbstractDocumentHighlightsService.<GetDocumentHighlightsInCurrentProcessAsync>d__1.MoveNext()
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
      at Microsoft.CodeAnalysis.DocumentHighlighting.AbstractDocumentHighlightsService.<GetDocumentHighlightsAsync>d__0.MoveNext()
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
      at Microsoft.CodeAnalysis.Remote.RemoteDocumentHighlightsService.<>c__DisplayClass2_0.<<GetDocumentHighlightsAsync>b__0>d.MoveNext()
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
      at Microsoft.CodeAnalysis.Remote.BrokeredServiceBase.<RunServiceImplAsync>d__12`1.MoveNext()

[CyrusNajmabadi]

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[jasonmalinowski]

Will be fixed by #49198.

[sbhenderson]

I recognize that this issue is closed, so I am hoping that this is not the incorrect place to put this. However, I have recently started running into this same exact issue described by the original report with a different exception text. This is in VS 2019 Enterprise 16.9.4. This will sound superstitious, but the error seems to show up most often when opening files containing a partial class that has had code generation performed via C# source generators affecting them, again, in a partial way. I may be able to come up with an example repro, if needed.

StreamJsonRpc.RemoteInvocationException: Object reference not set to an instance of an object.
at StreamJsonRpc.JsonRpc.d__1391.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Threading.Tasks.ValueTask1.get_Result()
at System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable1.ConfiguredValueTaskAwaiter.GetResult() at Microsoft.CodeAnalysis.Remote.BrokeredServiceConnection1.d__171.MoveNext() --- End of stack trace from previous location where exception was thrown --- at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject) RPC server exception: System.NullReferenceException: Object reference not set to an instance of an object. at Microsoft.CodeAnalysis.CodeLens.CodeLensReferencesService.<TryGetMethodDescriptorAsync>d__8.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.CodeAnalysis.CodeLens.CodeLensReferencesService.<>c__DisplayClass9_0.<<FindReferenceMethodsAsync>b__0>d.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.CodeAnalysis.CodeLens.CodeLensReferencesService.<FindAsync>d__11.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.CodeAnalysis.Remote.RemoteCodeLensReferencesService.<>c__DisplayClass5_0.<b__0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Threading.Tasks.ValueTask1.get_Result() at Microsoft.CodeAnalysis.Remote.BrokeredServiceBase.<RunServiceImplAsync>d__121.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject)

[jasonmalinowski]

@sbhenderson That issue you're seeing is #51633, not this one. (this was a cast exception, yours is the null reference exception.)