script error in chatbox

hi i keep getting this message when i click on the homepage

an error has occured in the scripts on this page

line 460
char 111
error object required
code 0
url http://mummysworld.8forum.net/chatbox-mod/messenger-send.forum?page=front&page=front

do you want to continue running scripts on this page?

please could you tell me what is wrong, thank you.

mmmmm , hey the chatbox comes automatically from ur forum , so i dont understand why are u getting errors , or maybe u mean another kind chat , i dont know be more specific .

yes its the chatbox on the home page, that in modules, when i go to the home page i get that error, hope ive explained that right, thanks for answering