Monodevelop compiler crash

I'm trying to get Mono to work o开发者_如何学Gon OSX, but i'm getting a strange error when trying to compile.

I get one error The compiler appears to have crashed. Check the build output pad for details.

The ouput is:

Building: DnsResolver (Debug)

Performing main compilation...

Corlib too old for this runtime. Loaded from: /Applications/MonoDevelop.app/Contents/MacOS/lib/moonlight/2.0/mscorlib.dll

Corlib too old for this runtime. Loaded from: /Applications/MonoDevelop.app/Contents/MacOS/lib/moonlight/2.0/mscorlib.dll Build complete -- 1 error, 0 warnings

--------------------- Færdig ---------------------

Build: 1 error, 0 warnings

I simply cannot find a solution to this Corlib problem. I hope someone can help me.