Unity cannot load / all scripts have become corrupt?

So when I tried to resume some unity work tonight every script that was attached to an object or such, now reads this error message? is it possible to fix this quickly, or do I need to redo a whole load of work?

“the associated script cannot be loaded. please fix any compile errors and assign a valid script unity”

Solved - Unity was erroring out because I called two “void OnTriggerEnter(Collider other)” instead of listing my two collider events under the same place.