RSRP-294691: ParentFolder != null

  at JetBrains.ProjectModel.ProjectItemBase.AssertIsValid() in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\Projects\src\model2\ProjectImplementation\ProjectItemBase.cs:line 169
     at JetBrains.ProjectModel.Impl.CachedProjectItemValue`2.GetValue() in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\Projects\src\impl\CachedProjectItemValue.cs:line 23
     at JetBrains.ProjectModel.ProjectFileImpl.get_Location() in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\Projects\src\model2\ProjectImplementation\ProjectFileImpl.cs:line 78
     at JetBrains.ReSharper.Psi.BuildScripts.PathUtil.GetFilePath(IBuildFile file) in c:\BuildAgent\work\3355b838ddaf4e5c\Psi.Features\src\Psi\BuildScripts\src\PathUtil.cs:line 68
     at JetBrains.ReSharper.Psi.BuildScripts.ReferenceManager.<>c__DisplayClass17.<ClearFileDeclarations>b__12(IDeclaration d) in c:\BuildAgent\work\3355b838ddaf4e5c\Psi.Features\src\Psi\BuildScripts\src\ReferenceManager.cs:line 160
     at System.Linq.Enumerable.<>c__DisplayClassf`1.<CombinePredicates>b__e(TSource x)
     at System.Linq.Enumerable.WhereArrayIterator`1.MoveNext()
     at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
     at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
     at JetBrains.ReSharper.Psi.BuildScripts.ReferenceManager.ClearFileDeclarations(FileSystemPath filePath) in c:\BuildAgent\work\3355b838ddaf4e5c\Psi.Features\src\Psi\BuildScripts\src\ReferenceManager.cs:line 160
     at JetBrains.ReSharper.Psi.BuildScripts.ReferenceManager.Execute(IChangeMap changeMap) in c:\BuildAgent\work\3355b838ddaf4e5c\Psi.Features\src\Psi\BuildScripts\src\ReferenceManager.cs:line 94
     at JetBrains.Application.Changes.ChangeManagerImpl.<>c__DisplayClassc.<InvokeOrderedDependentProviders>b__b(IChangeProvider dependentChangeProvider) in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\Shell\src\changes\ChangeManagerImpl.cs:line 261

  at JetBrains.Application.Changes.ChangeManagerImpl.<>c__DisplayClassc.<InvokeOrderedDependentProviders>b__b(IChangeProvider dependentChangeProvider) in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\Shell\src\changes\ChangeManagerImpl.cs:line 265
     at JetBrains.Util.CollectionUtil.ForEach[T](IEnumerable`1 collection, Action`1 action) in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\Util\src\Collections\CollectionUtil.cs:line 1571
     at JetBrains.Application.Changes.ChangeManagerImpl.<>c__DisplayClassc.<InvokeOrderedDependentProviders>b__a(IProgressIndicator pro) in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\Shell\src\changes\ChangeManagerImpl.cs:line 253
     at JetBrains.Application.Progress.SimpleTaskExecutor.ExecuteTask(String name, TaskCancelable cancelable, Action`1 task) in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\Shell\src\Progress\SimpleTaskExecutor.cs:line 66
     at JetBrains.Application.Changes.ChangeManagerImpl.InvokeOrderedDependentProviders(ITaskExecutor executor, IEnumerable`1 dependentProviders, ChangeMap changeMap) in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\Shell\src\changes\ChangeManagerImpl.cs:line 277
     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 218
     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.VsIntegration.ProjectModel.ProjectModelSynchronizer.OnAddHierarchy(IVsHierarchy hierarchy, Boolean updateProjectReferences) in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\VisualStudio\Core\src\ProjectModel\ProjectModelSynchronizer.cs:line 1376
     at JetBrains.VsIntegration.ProjectModel.VSSolutionManager.<>c__DisplayClassa.<OnAfterOpenProject>b__9() in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\VisualStudio\Core\src\ProjectModel\VSSolutionManager.cs:line 180
     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.OnAfterOpenProject(IVsHierarchy pHierarchy, Int32 fAdded) in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\VisualStudio\Core\src\ProjectModel\VSSolutionManager.cs:line 161
     at JetBrains.VsIntegration.DevTen.Src.ProjectModel.VsSolutionManager10.OnAfterOpenProject(IVsHierarchy pHierarchy, Int32 fAdded) in c:\BuildAgent\work\3355b838ddaf4e5c\Platform\src\VisualStudio\v10.v11\Src\ProjectModel\VSSolutionManager10.cs:line 208
     at Microsoft.VisualStudio.Shell.Interop.IVsPersistHierarchyItem2.ReloadItem(UInt32 itemid, UInt32 dwReserved)
     at Microsoft.VisualStudio.CommonIDE.ProjectRetargeting.TrackProjectRetargeting.ReloadProject(IVsHierarchy pHier)
     at Microsoft.VisualStudio.CommonIDE.ProjectRetargeting.TrackProjectRetargeting.OnSetTargetFrameworkInternal(IVsHierarchy projHier, FrameworkName currentTargetFrameworkObj, FrameworkName newTargetFrameworkObj, IVsSetTargetFrameworkWorkerCallback workerCallback, Boolean reload)
     at Microsoft.VisualStudio.CommonIDE.ProjectRetargeting.TrackProjectRetargeting.Microsoft.VisualStudio.Shell.Interop.IVsTrackProjectRetargeting.OnSetTargetFramework(IVsHierarchy projHier, String currentTargetFramework, String newTargetFramework, IVsSetTargetFrameworkWorkerCallback workerCallback, Boolean reload)
     at System.Windows.Forms.UnsafeNativeMethods.IDispatch.Invoke(Int32 dispIdMember, Guid& riid, Int32 lcid, Int32 dwFlags, tagDISPPARAMS pDispParams, Object[] pVarResult, tagEXCEPINFO pExcepInfo, IntPtr[] pArgErr)
     at System.Windows.Forms.ComponentModel.Com2Interop.Com2PropertyDescriptor.SetValue(Object component, Object value)
     at Microsoft.VisualStudio.Editors.PropertyPages.PropertyControlData.PropertyDescriptorSetValueHelper.SetValue(PropertyDescriptor Descriptor, Object Component, Object Value)
     at Microsoft.VisualStudio.Editors.PropertyPages.PropertyControlData.SetNonCommonPropertyValueCore(Object Value)
     at Microsoft.VisualStudio.Editors.PropertyPages.PropertyControlData.SetPropertyValueNative(Object Value)
     at Microsoft.VisualStudio.Editors.PropertyPages.PropertyControlData.ApplyChanges()
     at Microsoft.VisualStudio.Editors.PropertyPages.PropPageUserControlBase.ApplyPageChanges()
     at Microsoft.VisualStudio.Editors.PropertyPages.PropPageUserControlBase.Apply()
     at Microsoft.VisualStudio.Editors.PropertyPages.PropPageUserControlBase.IPropertyPageInternal_Apply()
     at Microsoft.VisualStudio.Editors.PropertyPages.PropPageBase.Apply()
     at Microsoft.VisualStudio.Editors.PropertyPages.PropPageBase.IPropertyPage_Apply()
     at Microsoft.VisualStudio.Editors.ApplicationDesigner.PropertyPageSite.ApplyStatusChange(UInt32 dwFlags)
     at Microsoft.VisualStudio.Editors.ApplicationDesigner.PropertyPageSite.OnStatusChange(UInt32 dwFlags)
     at Microsoft.VisualStudio.Editors.PropertyPages.PropPageBase.OnStatusChange(PROPPAGESTATUS flags)
     at Microsoft.VisualStudio.Editors.PropertyPages.PropPageUserControlBase.set_IsDirty(Boolean Value)
     at Microsoft.VisualStudio.Editors.PropertyPages.PropPageUserControlBase.SetDirty(Boolean ReadyToApply)
     at Microsoft.VisualStudio.Editors.PropertyPages.TargetFrameworkPropertyControlData.ComboBox_SelectionChangeCommitted(Object sender, EventArgs e)
     at System.EventHandler.Invoke(Object sender, EventArgs e)
     at System.Windows.Forms.ComboBox.OnSelectionChangeCommitted(EventArgs e)
     at System.Windows.Forms.ComboBox.OnSelectionChangeCommittedInternal(EventArgs e)
     at System.Windows.Forms.ComboBox.WmReflectCommand(Message& m)
     at System.Windows.Forms.ComboBox.WndProc(Message& m)
     at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
     at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
     at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
     at System.Windows.Forms.UnsafeNativeMethods.SendMessage(HandleRef hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
     at System.Windows.Forms.Control.SendMessage(Int32 msg, IntPtr wparam, IntPtr lparam)
     at System.Windows.Forms.Control.ReflectMessageInternal(IntPtr hWnd, Message& m)
     at System.Windows.Forms.Control.WmCommand(Message& m)
     at System.Windows.Forms.Control.WndProc(Message& m)
     at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
     at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
     at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
     at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
     at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
     at System.Windows.Forms.NativeWindow.DefWndProc(Message& m)
     at System.Windows.Forms.Control.DefWndProc(Message& m)
     at System.Windows.Forms.Control.WmCommand(Message& m)
     at System.Windows.Forms.Control.WndProc(Message& m)
     at System.Windows.Forms.ComboBox.WndProc(Message& m)
     at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
     at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
     at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)