This didn't happen before. When I am building a project, VS seems to freeze and then exits.
The event viewer has this log.
Application: devenv.exe
Framework Version: v4.0.30319
Description: The application requested process termination through System.Environment.FailFast(string message).
Message: System.AggregateException: One or more errors occurred. ---> System.ArgumentNullException: Value cannot be null.
Parameter name: key
at System.Collections.Generic.Dictionary`2.FindEntry(TKey key)
at System.Collections.Generic.Dictionary`2.TryGetValue(TKey key, TValue& value)
at Microsoft.CodeAnalysis.Diagnostics.EngineV2.DiagnosticIncrementalAnalyzer.StateManager.CreateBuildOnlyProjectStateSet(Project project)
at Microsoft.CodeAnalysis.Diagnostics.EngineV2.DiagnosticIncrementalAnalyzer.<SynchronizeWithBuildAsync>d__13.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 Microsoft.VisualStudio.LanguageServices.Implementation.TaskList.ExternalErrorDiagnosticUpdateSource.<CleanupAllLiveErrorsIfNeededAsync>d__22.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 Microsoft.VisualStudio.LanguageServices.Implementation.TaskList.ExternalErrorDiagnosticUpdateSource.<>c__DisplayClass21_0.<<OnSolutionBuild>b__0>d.MoveNext()
--- End of inner exception stack trace ---
---> (Inner Exception #0) System.ArgumentNullException: Value cannot be null.
Parameter name: key
at System.Collections.Generic.Dictionary`2.FindEntry(TKey key)
at System.Collections.Generic.Dictionary`2.TryGetValue(TKey key, TValue& value)
at Microsoft.CodeAnalysis.Diagnostics.EngineV2.DiagnosticIncrementalAnalyzer.StateManager.CreateBuildOnlyProjectStateSet(Project project)
at Microsoft.CodeAnalysis.Diagnostics.EngineV2.DiagnosticIncrementalAnalyzer.<SynchronizeWithBuildAsync>d__13.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 Microsoft.VisualStudio.LanguageServices.Implementation.TaskList.ExternalErrorDiagnosticUpdateSource.<CleanupAllLiveErrorsIfNeededAsync>d__22.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 Microsoft.VisualStudio.LanguageServices.Implementation.TaskList.ExternalErrorDiagnosticUpdateSource.<>c__DisplayClass21_0.<<OnSolutionBuild>b__0>d.MoveNext()<---
Stack:
at System.Environment.FailFast(System.String, System.Exception)
at Microsoft.CodeAnalysis.FailFast.OnFatalException(System.Exception)
at Microsoft.CodeAnalysis.ErrorReporting.FatalError.Report(System.Exception, System.Action`1<System.Exception>)
at Microsoft.CodeAnalysis.ErrorReporting.FatalError.Report(System.Exception)
at Roslyn.Utilities.TaskExtensions.ReportFatalErrorWorker(System.Threading.Tasks.Task, System.Object)
at System.Threading.Tasks.ContinuationTaskFromTask.InnerInvoke()
at System.Threading.Tasks.Task.Execute()
at System.Threading.Tasks.Task.ExecutionContextCallback(System.Object)
at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
at System.Threading.Tasks.Task.ExecuteWithThreadLocal(System.Threading.Tasks.Task ByRef)
at System.Threading.Tasks.Task.ExecuteEntry(Boolean)
at System.Threading.Tasks.ThreadPoolTaskScheduler.TryExecuteTaskInline(System.Threading.Tasks.Task, Boolean)
at System.Threading.Tasks.TaskScheduler.TryRunInline(System.Threading.Tasks.Task, Boolean)
at System.Threading.Tasks.TaskContinuation.InlineIfPossibleOrElseQueue(System.Threading.Tasks.Task, Boolean)
at System.Threading.Tasks.StandardTaskContinuation.Run(System.Threading.Tasks.Task, Boolean)
at System.Threading.Tasks.Task.FinishContinuations()
at System.Threading.Tasks.Task.FinishStageThree()
at System.Threading.Tasks.Task.FinishStageTwo()
at System.Threading.Tasks.Task.Finish(Boolean)
at System.Threading.Tasks.Task`1[[System.Threading.Tasks.TaskExtensions+VoidResult, System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].TrySetException(System.Object)
at System.Threading.Tasks.UnwrapPromise`1[[System.Threading.Tasks.TaskExtensions+VoidResult, System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].TrySetFromTask(System.Threading.Tasks.Task, Boolean)
at System.Threading.Tasks.UnwrapPromise`1[[System.Threading.Tasks.TaskExtensions+VoidResult, System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].ProcessInnerTask(System.Threading.Tasks.Task)
at System.Threading.Tasks.UnwrapPromise`1[[System.Threading.Tasks.TaskExtensions+VoidResult, System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].ProcessCompletedOuterTask(System.Threading.Tasks.Task)
at System.Threading.Tasks.UnwrapPromise`1[[System.Threading.Tasks.TaskExtensions+VoidResult, System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].InvokeCore(System.Threading.Tasks.Task)
at System.Threading.Tasks.UnwrapPromise`1[[System.Threading.Tasks.TaskExtensions+VoidResult, System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].Invoke(System.Threading.Tasks.Task)
at System.Threading.Tasks.Task.FinishContinuations()
at System.Threading.Tasks.Task.FinishStageThree()
at System.Threading.Tasks.Task.FinishStageTwo()
at System.Threading.Tasks.Task.Finish(Boolean)
at System.Threading.Tasks.Task.ExecuteWithThreadLocal(System.Threading.Tasks.Task ByRef)
at System.Threading.Tasks.Task.ExecuteEntry(Boolean)
at System.Threading.Tasks.Task.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
at System.Threading.ThreadPoolWorkQueue.Dispatch()
at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()