error on deleting members

I get an error when trying to delete members from the forums. I can batch delete them, but I cant specificly go in and delete just one member.

Error Type:
Microsoft JET Database Engine (0x80004005)
You cannot add or change a record because a related record is required in table 'tblAuthor'.
/forum/delete_member.asp, line 124

This is the error message I get. Everything else is working fine, just copied it in and it worked. Any ideas as to what I need to do?

I read the previous post on this...but unless doing a batch delete of members would take it out, it hasnt been touched. How would I add that ID 2 back into the guest account?  (I would do it now, but I am not at the server)

It looks the error is becuase you have somehow deleted the guest account which should be at position 2 in the tblAuthor table of the database.

Without this account functions like this won't work in the forum.