You need to install the Server Behaviors and Database extension from the Adobe Plugins store. The DMXZone is a new take on it and it doesn't work with our stuff.
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.