Visual Studio Errors On Default Script

I just installed Unity and VS onto a new Macbook Pro, but when I open up a default script I get errors:

alt text

I have Unity Tools extension installed, and this doesn’t happen on my PC. Anybody know what might be happening?

Thanks Guys/Gals

I also have this problem sometimes when I update Unity.

I found a way to solve this problem:

In Unity, go to Edit-> Preferences->External Tools ans click on “Regenerate project files”.