I'm trying to delete an extension but the username is configured with 3CX WebMeeting . The webmeeting is deactivated so I want to activate it again . When I click settings -> Web Meeting -> Activate , I receive the error attached in the image , and user and access upper menu from webmeeting is not appearing. I've also restarted the machine . Can someone help me to get rid of this error , and finaly remove the extension ? 3CX System Standard Edition , Version v12 with SP 6.1 .