thanks for your attention and your reply:) but if i create and modify tables form 2005 and create and modify diagram from 2000.does any problem occure or not problem? thanks again. Human knowlege belongs to the world

I found reson of error and handle it at last. this was because i new another form in this form and don't using them,i think this resource that don't be free occured problems. however i solved this finally.thanks for your attention.