DW CC 2014 or 2014.1?
Make sure you have al updates to Dreamweaver installed. also make sure you have the latest updates t the extension manager installed, then uninstall Data Bridge and install it again in the extension manager.
after installing it again the extension manager, make sure the WebAssist installer runs when you open DW. if it does not launch automatically, open a php page to force it to start. after it completes, restart DW.