I don't know what had happened.....but today noone is able to post.....to create new topic, etc...

It gives the following:

Could not insert forum post

What am I to do?

I tried to delete Forum, saving the database....then installed it again....it gave me do everything...but I had no messages....

So I've got 2 things:
unworking newbb module with all messages...
or
working newbb with no old messages...

or
there is a way out?

Help me Please!!!
P.S. Sorry for my English....I'm from Russia!