Error Message

if i am in a chatroom that i created and then click on the same link for the chatroom in the primary links section i keep getting a error pop up with the following message

An Http error 0 occured /chatroom/js

can you tell what is the problem
i thought there might be a problem of since there is no message it might be occuring but that is not the problem i added a message and clicked on the chatroom link and still the same