warning: call_user_func_array() [function.call-user-func-array]

I created a chat, checked to have it displayed on front page, finished.
Went to homepage and clicked to demote (remove from front page) via fasttoogle module and I get this error at the top of home:

    * warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'theme_chatroom_last_message' was given in /home5/teamueco/public_html/drupal/includes/theme.inc on line 597.
    * user warning: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'WHERE nid = 18' at line 8 query: UPDATE drupal_chatroom SET poll_freq = 1000000, idle_freq = 60000000, old_msg_count = 20, kicked_out_message = '', banned_message = '', WHERE nid = 18 in /home5/teamueco/public_html/drupal/sites/all/modules/chatroom/chatroom.module on line 157.

I refresh the page and the error is gone

Thanks