I get that error every time I try to wire up my event handler to an event
exposed by a COM object. Everything compiles correctly but the app blows up
when I actually try to add my event handler to the chain.

Is there something general I should be watching out for or is this problem
specific to AutoCAD?

P.S. I'll be glad to post or forward code upon request. I know AutoCAD isn't
a general topic so I didn't want to post code no one would use.

"If you want to be somebody else change your mind"