Visual Studio 2015 - Nuget Exception - GetFullVsVersionString must be called on the UI thread

Question

While attempting to build or open a project in Visual Studio 2015 Update 3, I keep getting errors around nuget package management.
Whenever I build the project the first time after opening VS, I get the error message below.
I also get it when I try to open the nuget package manager dialog.
Anyone else experience this?

An exception was thrown while initializing part
"Nuget.PackageManagement.VisualStudio.VSolutionManager".
GetFullVsVersionString must be called on the UI thread.

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Here is another thread in stack about this issue :

Visual Studio 2015 Initializing Part Nuget.PackageManagement.VisualStudio.VSolutionManager must be called on UI Thread

And here is in github :
GetFullVsVersionString must be called on the UI thread #3419

People say install this plugin for fix this issue.
But when i open that url i face this error :

We're sorry, the page you requested cannot be found!

In VisualStudio 2015 -> Tools -> Extensions and updates -> Online: Search for the string: "Fix NuGet GetFullVsVersionString must be called on the UI thread" and install the given fix.

Alternatively you can download the fix at : GetFullVsVersionString fix

Now in February 2018, the latest NuGet Package Manager version 3.4.4.1321 does not have the fix included, so the patch must be applied.

As Steve Greene's answer describes, I also had the Telerik extension installed, so that might have caused the problem.

I searched that phrase in VS - But could n't find anything.
Also GetFullVsVersionString fix does n't exist any more.
I also reinstalled nuget package manager - no help.
What is the solution?

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EDIT 1 :
When i delete .vs hidden folder and open VS error vanished.
but when i close VS & reopen it again i face that error again.
What is wrong about .vs hidden folder?

Answer 1

Several suggestions:

1) disable any third installed party extensions under Tools--> Extensions and Updates--> Installed to check whether there is an extension that caused this issue.

2) Close VS, delete all files under C:UsersxxxAppDataLocalMicrosoftVisualStudio14.0ComponentModelCache

You can also delete .vs hidden folder, bin and obj folder of the project.

Then, restart VS to test again.

Further, try to reinstall Nuget Package Manager extension again.

3) restore VS environment, enter C:UsersAdministratorAppDataLocalMicrosoftVisualStudio14.0

And you can just rename the 14.0 folder to another name like VS2015_Backup(just make a backup for your VS2015 environment).

Then, restart VS to test the issue.

4) open Control Panel-->Programs and Features-->right-click on VS2015 Program-->change-->Repair