ApplicationException: Unable to find a suitable compiler?

My application contains compiled assemblies. Does this error mean there is some issue with the code before it was compiled into an assembly? If so, any ideas what could cause this as the original code (before being compiled) runs fine.

I’m thinking that the problem might be with some scripts trying to add components to gameobjects when those components are actually now compiled assemblies.

Or is there a more obvious answer.

Any help gratefully received.

Thanks!

seems to be an answer