The extension can give this error when it doesn't connect to your database correctly. Let's do a screen sharing session and I can debug this with you. Please contact me via Skype to coordinate a good time.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.