you say you installed in this order:
CSS Menu Writer (2.0.6)
eCart 5.0.6
Data Bridge 1.1.3
WebAssist Free Tools 1.0.2
it is better to install Data Bridge last:
CSS Menu Writer (2.0.6)
eCart 5.0.6
WebAssist Free Tools 1.0.2
Data Bridge 1.1.3
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.