mscorlib version conflict during build

Question

On a new Win8.1 reinstall, with all of my code restored from backup, I\'m suddenly now getting a Visual Studio warning when I build the main project of my solution:

Answer 1

I've tried all the following, but none has resolved the issue.

1. the command "update-package -reinstall".
2. Update and package via Consolidate tab.
3. Removing the ".suo" file.

However, My issue was a different case, I guess the new version of Xamarin.Forms package has used a different version of mscorlib. so I've downgraded it and it works fine.

I suggest you try all above solutions and also try to find which package is conflicting.