This extension is obsolete. Please install the VS 2015 Update 1 to fix this problem.
Fixes the "One or more errors occurred" error of VS2015 when you try to use the "Go to definition (F12)" command on system type in C#.
An error occurs if you set "Keep tabs" instead of "Insert spaces" in C# settings (Options -> Text Editor -> C#). This extension just automatically change that setting when you use the F12 and immediately restores it back. Thus, you can use F12 and "Keep tabs" without problems.