It looks like the installer didn't run properly. The earlier issue was a file cache error, but this one looks like old or missing files.
Try closing Dreamweaver, reinstalling the extension, and then opening Dreamweaver again. That should cause our installer to run the next time you open a file in Dreamweaver. After that runs, then close Dreamweaver again and clear the cache file as outlined in: http://www.webassist.com/community/tutorials/view_tutorial.php?tid=95
If you still get errors, post back here with your phone number and I'll give you a call and do screen sharing with you tomorrow or monday and debug what is going on to get it working for you.