I'm going to have to debug this with you directly. The errors don't make sense. The fact that you are getting errors in native Dreamweaver extensions and calling native dreamweaver functions makes it all the more confusing.
I'd try this:
1) close Dreamweaver
2) Re-install the depricated server behaviors extension
3) Clear the cache.dat file
4) Re-open Dreamweaver
If you still get the errors after that, please post back here with a phone number and good time to reach you and I'll debug this with you in a screen sharing session.