xthreads error

[1master1]

Well, i'm in position to figure out the join table problem if i know where that query is being called. But, when it shows error while accessing or when it saves that error in error log, i see that it displays only the query information and no details of the location, and i'm sure it is not caused because of the default xthread files. There is another plugin file or core file while is already modified with the xthreads is causing the error.

Can't find where the error is being generated. But i had seen that when a new user registers and when he gets autologged in and when he browses the forums, the error is generated. I had set the forum permissions (can see forum list but not access) for the awaiting activation members.