StreamJsonRpc.RemoteInvocationException: The given key was not present in the dictionary. ---> System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject)
   --- End of inner exception stack trace ---
   at StreamJsonRpc.JsonRpc.<InvokeCoreAsync>d__139`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.Remote.BrokeredServiceConnection`1.<TryInvokeAsync>d__19.MoveNext() in D:\R1\src\Workspaces\Remote\Core\BrokeredServiceConnection.cs:line 301
RPC server exception:
System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
      at System.Collections.Concurrent.ConcurrentDictionary`2.get_Item(TKey key)
      at Microsoft.CodeAnalysis.FindSymbols.FindReferencesSearchEngine.<ProcessDocumentAsync>d__18.MoveNext() in D:\R1\src\Workspaces\Core\Portable\FindSymbols\FindReferences\FindReferencesSearchEngine.cs:line 276
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at Microsoft.CodeAnalysis.FindSymbols.FindReferencesSearchEngine.<ProcessDocumentAsync>d__17.MoveNext() in D:\R1\src\Workspaces\Core\Portable\FindSymbols\FindReferences\FindReferencesSearchEngine.cs:line 258
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at Microsoft.CodeAnalysis.FindSymbols.FindReferencesSearchEngine.<ProcessDocumentAsync>d__17.MoveNext() in D:\R1\src\Workspaces\Core\Portable\FindSymbols\FindReferences\FindReferencesSearchEngine.cs:line 268
   --- 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.FindSymbols.FindReferencesSearchEngine.<ProcessProjectAsync>d__15.MoveNext() in D:\R1\src\Workspaces\Core\Portable\FindSymbols\FindReferences\FindReferencesSearchEngine.cs:line 215
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at Microsoft.CodeAnalysis.FindSymbols.FindReferencesSearchEngine.<ProcessProjectAsync>d__15.MoveNext() in D:\R1\src\Workspaces\Core\Portable\FindSymbols\FindReferences\FindReferencesSearchEngine.cs:line 225
   --- 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.FindSymbols.FindReferencesSearchEngine.<FindReferencesAsync>d__11.MoveNext() in D:\R1\src\Workspaces\Core\Portable\FindSymbols\FindReferences\FindReferencesSearchEngine.cs:line 112
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at Microsoft.CodeAnalysis.FindSymbols.FindReferencesSearchEngine.<FindReferencesAsync>d__11.MoveNext() in D:\R1\src\Workspaces\Core\Portable\FindSymbols\FindReferences\FindReferencesSearchEngine.cs:line 112
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at Microsoft.CodeAnalysis.FindSymbols.FindReferencesSearchEngine.<FindReferencesAsync>d__11.MoveNext() in D:\R1\src\Workspaces\Core\Portable\FindSymbols\FindReferences\FindReferencesSearchEngine.cs:line 116
   --- 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.FindSymbols.SymbolFinder.<FindReferencesAsync>d__34.MoveNext() in D:\R1\src\Workspaces\Core\Portable\FindSymbols\SymbolFinder_FindReferences_Current.cs:line 54
   --- 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.Editor.FindUsages.AbstractFindUsagesService.<FindReferencesAsync>d__15.MoveNext() in D:\R1\src\EditorFeatures\Core\FindUsages\AbstractFindUsagesService_FindReferences.cs:line 149
   --- 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.RemoteFindUsagesService.<>c__DisplayClass3_0.<<FindReferencesAsync>b__0>d.MoveNext() in D:\R1\src\Workspaces\Remote\ServiceHub\Services\FindUsages\RemoteFindUsagesService.cs:line 52
   --- 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__15.MoveNext() in D:\R1\src\Workspaces\Remote\ServiceHub\Services\BrokeredServiceBase.cs:line 117
   --- 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)