Says "Unable to start Debugging", can not debug anymore

Question

I've had visual studio for 1 month and it has been working fine but all of a sudden today, I get this error message.

 "Unable to start Debugging.

 The debugger is not properly installed. Run Setup to install or repair the debugger."

I've tried googleing this but the only errors I could find were when people recently installed visual studio. My debugger has been working fine until now. I've tried reinstalling the packets but that hasn't helped. I've tried repairing visual studio and that hasnt helped either. Any ideas on what else I can do?