you have both CSS Form Builder 2.0.1 and Form Toolkit 1.0 installed. this is creating a conflict.
uninstall them, then install Form Builder again
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.