Thanks pointing to the right direction!
I removed config.php from [moodledata]/muc catalog, run cache clean, new config file generated and the problem disappeared.
Thanks pointing to the right direction!
I removed config.php from [moodledata]/muc catalog, run cache clean, new config file generated and the problem disappeared.
yeah it worked.
how to run cache clean, so that config.php recreated??
yoursite/admin/purgecaches.php
THANK YOU!! It worked perfectly. *whew*