Visual Studio 15 CTP Project refence error: an item that says "" already exists

I am trying to use Visual C ++ for Visual Studio 2014 for development, but for any project that I open, I always get the same error when loading the project:

An item labeled "" already exists in the tree with the same sort order as the item to be added.

Project links are empty with or without a warning sign.

How to solve this problem?

K packages from myget.org/F/aspnetvnext

> C:\Users\user>kvm upgrade
Determining latest version
KRE-CLR-x86.1.0.0-beta2-10679 already installed.
Adding C:\Users\user\.kre\packages\KRE-CLR-x86.1.0.0-beta2-10679\bin to process PATH
Adding C:\Users\user\.kre\packages\KRE-CLR-x86.1.0.0-beta2-10679\bin to user PATH
Updating alias 'default' to 'KRE-CLR-x86.1.0.0-beta2-10679'

Error information for https://github.com/aspnet/Logging/tree/2d54539a112e6d54c3d5de6dd825258c66787086

An error has occurred in the project system.

An item labeled "already exists in the tree with the same sort order as the item to be added.

_ :" C:\Users\user\AppData\Local\Temp\VsProjectFault_28a9e6d4-ab42-441b-b4fe-124423dae4cb.failure.txt"._

:

===================
09.11.2014 13:45:34
Recoverable
System.AggregateException: One or more errors occurred. ---> System.ArgumentException: An item with the caption "" already exists in the tree with the same sort order as the item being added.
 at Microsoft.VisualStudio.ProjectSystem.Designers.ProjectTree.Add(UnattachedProjectTreeNode node)
 at Microsoft.VisualStudio.ProjectSystem.Designers.ProjectTree.Add(IProjectTree subtree)
 at Microsoft.VisualStudio.Web.ProjectSystem.ReferencesSubTreeProvider.<>c__DisplayClass10.<BuildReferencesTreeAsync>b__12()
 at System.Threading.Tasks.Task`1.InnerInvoke()
 at System.Threading.Tasks.Task.Execute()
--- 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.Web.ProjectSystem.ReferencesSubTreeProvider.<>c__DisplayClass8.<<ReferencesChanged>b__9>d__0.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.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
 at Microsoft.VisualStudio.ProjectSystem.Utilities.Designers.ProjectTreeProviderBase.<>c__DisplayClass0.<<Initialize>b__2>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
 at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
 at Microsoft.VisualStudio.ProjectSystem.Utilities.CommonProjectSystemTools.Rethrow(Exception ex)
 at Microsoft.VisualStudio.ProjectSystem.ProjectErrorReporting.<>c__DisplayClass4.<SubmitErrorReport>b__6()
 at Microsoft.VisualStudio.ProjectSystem.ExceptionFilter.<>c__DisplayClass0.<Guard>b__2()
 at GuardMethodClass.GuardMethod(Func`1 , Func`2 , Func`2 )
--- End of inner exception stack trace ---
---> (Inner Exception #0) System.ArgumentException: An item with the caption "" already exists in the tree with the same sort order as the item being added.
 at Microsoft.VisualStudio.ProjectSystem.Designers.ProjectTree.Add(UnattachedProjectTreeNode node)
 at Microsoft.VisualStudio.ProjectSystem.Designers.ProjectTree.Add(IProjectTree subtree)
 at Microsoft.VisualStudio.Web.ProjectSystem.ReferencesSubTreeProvider.<>c__DisplayClass10.<BuildReferencesTreeAsync>b__12()
 at System.Threading.Tasks.Task`1.InnerInvoke()
 at System.Threading.Tasks.Task.Execute()
--- 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.Web.ProjectSystem.ReferencesSubTreeProvider.<>c__DisplayClass8.<<ReferencesChanged>b__9>d__0.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.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
 at Microsoft.VisualStudio.ProjectSystem.Utilities.Designers.ProjectTreeProviderBase.<>c__DisplayClass0.<<Initialize>b__2>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
 at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
 at Microsoft.VisualStudio.ProjectSystem.Utilities.CommonProjectSystemTools.Rethrow(Exception ex)
 at Microsoft.VisualStudio.ProjectSystem.ProjectErrorReporting.<>c__DisplayClass4.<SubmitErrorReport>b__6()
 at Microsoft.VisualStudio.ProjectSystem.ExceptionFilter.<>c__DisplayClass0.<Guard>b__2()
 at GuardMethodClass.GuardMethod(Func`1 , Func`2 , Func`2 )<---
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