RSRP-293885: 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 JetBrains.Util.OneToSetMap`2.TryGetValues(TKey key) in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\Util\src\Collections\OneToSetMap.cs:line 130
     at JetBrains.Util.OneToSetMap`2.Remove(TKey key, TValue value) in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\Util\src\Collections\OneToSetMap.cs:line 101
     at JetBrains.ReSharper.UnitTestFramework.Elements.UnitTestElementProjectFileCache.RemoveElement(IUnitTestElement element) in c:\BuildAgent\work\3355b838ddaf4e5c\Psi.Features\src\UnitTesting\_Core\src\Elements\UnitTestElementProjectFileCache.cs:line 31
     at JetBrains.ReSharper.UnitTestFramework.Elements.UnitTestElementManager.RemoveElement(IUnitTestElement element) in c:\BuildAgent\work\3355b838ddaf4e5c\Psi.Features\src\UnitTesting\_Core\src\Elements\UnitTestElementManager.cs:line 54
     at JetBrains.ReSharper.UnitTestFramework.Elements.UnitTestElementManager.RemoveElements(IEnumerable`1 elements) in c:\BuildAgent\work\3355b838ddaf4e5c\Psi.Features\src\UnitTesting\_Core\src\Elements\UnitTestElementManager.cs:line 108
     at JetBrains.ReSharper.UnitTestFramework.UnitTestChangeListener.OnChanged(ChangeEventArgs e) in c:\BuildAgent\work\3355b838ddaf4e5c\Psi.Features\src\UnitTesting\_Core\src\UnitTestChangeListener.cs:line 120
     at JetBrains.DataFlow.Signal`1.NotifySinks(TValue payload) in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\Util\src\DataFlow\Signal!1.cs:line 363

  at JetBrains.DataFlow.Signal`1.NotifySinks(TValue payload) in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\Util\src\DataFlow\Signal!1.cs:line 367
     at JetBrains.DataFlow.Signal`1.Fire(TValue value, Object cookie) in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\Util\src\DataFlow\Signal!1.cs:line 524
     at JetBrains.DataFlow.Signal`1.Fire(TValue value) in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\Util\src\DataFlow\Signal!1.cs:line 473
     at JetBrains.Application.Changes.ChangeManagerImpl.OnProviderChanged(IChangeProvider changeProvider, Object change, ITaskExecutor executor) in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\Shell\src\changes\ChangeManagerImpl.cs:line 220
     at JetBrains.ProjectModel.Transaction.ProjectModelBatchChangeManager.EndTransaction(ProjectModelBatchChange projectModelBatchChange, ITaskExecutor executor) in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\Projects\src\model2\Transaction\ProjectModelBatchChangeManager.cs:line 49
     at JetBrains.ProjectModel.Impl.ProjectModelBatchChange.Commit(ITaskExecutor executor) in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\Projects\src\model2\Transaction\ProjectModelBatchChange.cs:line 51
     at JetBrains.ProjectModel.Transaction.ProjectModelBatchChangeCookie.Dispose() in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\Projects\src\Transaction\ProjectModelBatchChangeCookie.cs:line 25
     at JetBrains.ProjectModel.ProjectImpl.DoRemove() in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\Projects\src\model2\ProjectImplementation\ProjectImpl.cs:line 293
     at JetBrains.VsIntegration.ProjectModel.ProjectModelSynchronizer.RemoveMapping(IVsHierarchy hierarchy, VSProjectInfo projectInfo) in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\VisualStudio\Core\src\ProjectModel\ProjectModelSynchronizer.cs:line 1458
     at JetBrains.VsIntegration.ProjectModel.ProjectModelSynchronizer.MyRemoveHierarchyVisitor.RemoveAll() in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\VisualStudio\Core\src\ProjectModel\ProjectModelSynchronizer.cs:line 1414
     at JetBrains.VsIntegration.ProjectModel.ProjectModelSynchronizer.OnRemoveHierarchy(IVsHierarchy hierarchy) in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\VisualStudio\Core\src\ProjectModel\ProjectModelSynchronizer.cs:line 1444
     at JetBrains.VsIntegration.ProjectModel.VSSolutionManager.<>c__DisplayClass13.<OnBeforeCloseProject>b__12() in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\VisualStudio\Core\src\ProjectModel\VSSolutionManager.cs:line 301
     at JetBrains.Util.Concurrency.UnguardedCallbackMerger.<>c__DisplayClass3.<ExecuteOrQueueOrMerge>b__0() in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\Util\src\Concurrency\UnguardedCallbackMerger.cs:line 139
     at JetBrains.Threading.ReentrancyGuard.Execute(String name, Action action) in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\Util\src\Concurrency\ReentrancyGuard.cs:line 266
     at JetBrains.Threading.ReentrancyGuard.TryExecute(String name, Action action) in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\Util\src\Concurrency\ReentrancyGuard.cs:line 415
     at JetBrains.Threading.ReentrancyGuardEx.ExecuteOrQueue(ReentrancyGuard thіs, Lifetime lifetime, String name, Action F) in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\Util\src\Concurrency\ReentrancyGuardEx.cs:line 64
     at JetBrains.Util.Concurrency.UnguardedCallbackMerger.ExecuteOrQueueOrMerge(Lifetime lifetimeQueue, String name, Action F) in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\Util\src\Concurrency\UnguardedCallbackMerger.cs:line 136
     at JetBrains.VsIntegration.ProjectModel.VSSolutionManager.OnBeforeCloseProject(IVsHierarchy pHierarchy, Int32 fRemoved) in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\VisualStudio\Core\src\ProjectModel\VSSolutionManager.cs:line 262
     at Microsoft.VisualStudio.Shell.Interop.IVsUIDataSource.Invoke(String verb, Object pvaIn, Object& pvaOut)
     at Microsoft.Internal.VisualStudio.PlatformUI.DataSource.Invoke(String verb, Object pvaIn, Object& pvaOut)
     at Microsoft.VisualStudio.PlatformUI.VsCommand.Execute(Object parameter)
     at MS.Internal.Commands.CommandHelpers.CriticalExecuteCommandSource(ICommandSource commandSource, Boolean userInitiated)
     at System.Windows.Controls.MenuItem.InvokeClickAfterRender(Object arg)
     at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
     at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
     at System.Windows.Threading.DispatcherOperation.InvokeImpl()
     at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
     at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
     at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
     at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
     at System.Windows.Threading.DispatcherOperation.Invoke()
     at System.Windows.Threading.Dispatcher.ProcessQueue()
     at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
     at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
     at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
     at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
     at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
     at System.Windows.Threading.DispatcherOperation.InvokeImpl()
     at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
     at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
     at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
     at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
     at System.Windows.Threading.DispatcherOperation.Invoke()
     at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherOperation operation, CancellationToken cancellationToken, TimeSpan timeout)
     at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
     at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
     at Microsoft.VisualStudio.PlatformUI.NativeMethods.DispatchMessage(MSG& lpmsg)
     at Microsoft.VisualStudio.Platform.WindowManagement.WindowManagerService.<PushMessageLoopOnContextMenuTrackingComponent>b__69(Object sender, PreTranslateMessageEventArgs args)
     at Microsoft.VisualStudio.PlatformUI.OleComponentSupport.OleComponent.FPreTranslateMessageCore(MSG[] pMsg)
     at Microsoft.VisualStudio.PlatformUI.OleComponentSupport.OleComponent.Microsoft.VisualStudio.OLE.Interop.IOleComponent.FPreTranslateMessage(MSG[] pMsg)
     at Microsoft.VisualStudio.OLE.Interop.IOleComponentManager.FPushMessageLoop(UInt32 dwComponentID, UInt32 uReason, IntPtr pvLoopData)
     at Microsoft.VisualStudio.Platform.WindowManagement.WindowManagerService.PushMessageLoopOnContextMenuTrackingComponent()
     at Microsoft.VisualStudio.Shell.Interop.IVsUIHierarchy.ExecCommand(UInt32 itemid, Guid& pguidCmdGroup, UInt32 nCmdID, UInt32 nCmdexecopt, IntPtr pvaIn, IntPtr pvaOut)
     at Microsoft.VisualStudio.Labs.HierarchyUtilities.<>c__DisplayClass22.<ExecHierParentChain>b__1e()
     at Microsoft.VisualStudio.ErrorHandler.CallWithCOMConvention(Func`1 method)
     at Microsoft.VisualStudio.Labs.HierarchyUtilities.ExecHierParentChain(IVsHierarchyItemManager manager, IVsUIHierarchy lpUIHCmd, IVsUIHierarchy lpUIHCurrent, UInt32 itemidCurrent, Guid& pguidCmdGroupRef, UInt32 nCmdID, UInt32 nCmdexecopt, IntPtr pvaIn, IntPtr pvaOut)
     at Microsoft.VisualStudio.Labs.HierarchyUtilities.ExecHierParentChain(IVsHierarchyItemManager manager, IVsUIHierarchy lpUIHCmd, IVsUIHierarchy lpUIHCurrent, UInt32 itemidCurrent, Guid& pguidCmdGroupRef, UInt32 nCmdID, UInt32 nCmdexecopt, IntPtr pvaIn, IntPtr pvaOut)
     at Microsoft.VisualStudio.Labs.HierarchyItem.HierarchyContextMenuController.ShowContextMenu(IEnumerable`1 items, Point location)
     at Microsoft.VisualStudio.Labs.ContextMenuController.ShowContextMenu(IEnumerable`1 items, Point location, Func`2 getController)
     at Microsoft.VisualStudio.Labs.ContextMenuController.ShowContextMenu(IEnumerable`1 items, Point location)
     at Microsoft.VisualStudio.Labs.PivotTreeView.OnContextMenuOpening(ContextMenuEventArgs e)
     at System.Windows.FrameworkElement.OnContextMenuOpeningThunk(Object sender, ContextMenuEventArgs e)
     at System.Windows.Controls.ContextMenuEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
     at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
     at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
     at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
     at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
     at System.Windows.ContentElement.RaiseTrustedEvent(RoutedEventArgs args)
     at System.Windows.ContentElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)
     at System.Windows.Controls.PopupControlService.RaiseContextMenuOpeningEvent(IInputElement source, Double x, Double y, Boolean userInitiated)
     at System.Windows.Controls.PopupControlService.ProcessMouseUp(Object sender, MouseButtonEventArgs e)
     at System.Windows.Controls.PopupControlService.OnPostProcessInput(Object sender, ProcessInputEventArgs e)
     at System.Windows.Input.InputManager.RaiseProcessInputEventHandlers(ProcessInputEventHandler postProcessInput, ProcessInputEventArgs processInputEventArgs)
     at System.Windows.Input.InputManager.ProcessStagingArea()
     at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
     at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
     at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
     at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
     at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
     at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
     at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
     at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
     at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
     at System.Windows.Threading.DispatcherOperation.InvokeImpl()
     at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
     at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
     at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
     at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
     at System.Windows.Threading.DispatcherOperation.Invoke()
     at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherOperation operation, CancellationToken cancellationToken, TimeSpan timeout)
     at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
     at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)