The error was right after the “&”. I changed the project name and the errors disappeared.
,I had the same problem when my project folder was “C&C”, but it only seemed to show up once I
I opened Assembly-UnityScript.unityproj in textedit.
Edit/Find/Select Line.
The line referenced a script in my Unity project.
Went into Unity and deleted the script from my project. That fixed it.
As a test, I dropped the same script back into the Unity project and got the same error with a different line number and position. The script had about 5 lines of code in it and no syntax errors. I’m still not sure why this happened but its fixed. Hope this helps someone.
Found another solution to when you might get this error! I had put two different imported plugins into a directory called “Plugins” which apparently is a special Unity folder. This broke the ability for monodevelop to sync my project and it only provided the very unhelpful error message that lead me to this post. Moving my plugins into a folder called “External” solved this. You can name it whatever you want, but just realize that if you are trying to organize your imported plugins (NGUI, inControl, etc) DON’T put them in “Plugins”.