ADDING LINKS returns DATABASE QUERY ERROR

I have been adding links on my Links page succesfully.  All of a sudden, when I add a new link, and I get

"Database Query Error".

What's the problem?  Please help!

Thanks,

Lisa

Same thing happened for me with the group categories. I then discovered that the new group categories I thought I had added really did not exist. They looked good in the admin but the links did not work. They were missing the actual folder.

If you get database error plz. post the report that you get through email