Bug Buddy dialog box keeps opening on Ubuntu

I don't know what is the cause..... but sometimes this phenomenon happens. When the bug buddy keeps bugging you with this error message " The information about the crash has been successfully collected.
The application that crashed is not known to bug-buddy, therefore the bug report can not be sent to the GNOME Bugzilla. Please save the bug to a text file and report it to the appropriate bug tracker for this application.", the solution is,

1. Open your terminal. If cannot, press ctrl+alt+F1.
2. Type this command -> rm ~/.recently-used.xbel
3. Restart your pc.