If you are having trouble starting CAESES although it worked before, it might help to manually reset it to factory settings.
In order to do so, navigate to the following folder:
Linux: ~/.friendship/etc/ Windows: %APPDATA%/friendship/etc/
and delete all files in there. Please note that this is not the installation directory of CAESES. On Windows, you can enter the path into the address bar of the Windows Explorer (Win+E) exactly like it is shown here.