Bug when I create a new ticket or add a note - Unknown column ....

Hi,

I have an otrs in my company and we have a problem when we create ticket or add note on ticket already existing.

the error is :

Unknown column 'a_message_id_md5' in 'field list', SQL: 'INSERT INTO article (ti[..]

Anybody have an idea of the origin of this problem ?

Cordially

Thomas.