DataAssist 2.1.0
Universal Email 4.0.1
SecurityAssist 2.0.5
Universal Email 4.0.1 and SecurityAssist 2.0.5 are a part of data Bridge, you should not have those installed as stand alones.
uninstall all extensions, the reinstall only Design Extender and Data Bridge, having UE and Security Assist installed is causing a conflict.