What version of Data Bridge is installed?
Make sure that you have the most recent version, 1.1.8. If you have a previous version installed, make sure to uninstall it from the extension manager before installing the newer one.
Also, what version of Dreamweaver are you using? if you are using DW CC, make sure that you have installed the deprecated server behaviors extension:
http://www.webassist.com/tutorials/Server-behaviors-for-Dreamweaver-Creative-Cloud