I am getting this error in a few modules. compile.e, GitClass.e, Perforce.e, svc.e and window.e. When I try to load them as modules in the Macros menu, I get an "Illegal Character" in the status bar and it loads "wkspace.e" which looks completely messed up -- a whole bunch of "^@" characters at the beginning.
I can only assume this means that the wkspace.e file has gotten corrupted. I'm going to try uninstalling Slickedit and reinstalling it unless you have a better thing to do.