Microsoft.VisualStudio.Web.PasteJson.JsonPackage did not load properly

Question

I have visual studio express 2012 and it was working fine earlier I had run my solution once. But now when I do it, there appears a dialog box with the message!

Answer 1

Not relevant to VS 2012 express, but I experienced this problem with VS 2013 Premium. I had recently added the productivity power tools extension. To get back up and running, I loaded Visual Studio in safe mode:

C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE>devenv /safemode

And un-installed the productivity tools. The errors went away.