Cache Error

I cant seem to fix this:

I have tried the following:
*Verifying tool cache
*Refreshing SDK content
*Restarting Steam

Have any ideas?

The odd thing is, SDK was working fine last night…but I try it the next morning annnnnnnnnnd broke! : \

Try pushing a few fivers into the slot.

Say what? lol

After some friends helping me out. We found a link that told us just to launch the game we compile in and it would fix it. It did.