Could not obtain a C# compiler.

I just started up Xamarin Studio today and any time I try to build an iOS project I get the following error:

Could not obtain a C# compiler. C# compiler not found for Xamarin.iOS

The only things my searching turned up where answers to similar questions for monotouch and I'm not sure if those fixes apply here. http://askubuntu.com/questions/73630/could-not-obtain-c-compiler-error-when-using-monodevelop