monodevelop not autocompleting c#

autocompleting suddenly stopped working in my unity project scripts
However, if I create a new project and a new sript autocompleting wroks
I think, there is something wrong with my project, but WHAT?
please help

Answering my own question
I divided my hard drive into several parts and kept my project separately on one of them
So Unity and Monodev were installed on disk C and project was located on U
I moved it to C and autocompleting works now