1046 Error when compiling

I’m working on a project in as3 using Flash CS3. I just finished typing in a bunch of new code into a project that is in good working order. Upon compiling I received a 1046 compile error for the first import… import flash.display.MovieClip; This new code added some functions that are called by the new buttons that I made. Now it appears that the entire object is completely corrupted, as even removing all the work I did still gives me the same compiling error.

I encountered this problem before and did some nasty workarounds for a quick fix. I really really don’t want to have to do that again. Please help! Is there a problem with CS3? It seems like something is getting corrupted in their compiling process. Any ideas?