oscommerce contributions repair

Hi on my oscommerce site there are 2 contribs installed by some other programmer who couldn't get the job done ! Hopefully one of you can. The event calendar is not working properly as i get an error in the admin section when i try to create a new event Easy populate doesn't function at all. Allthough i am on a tight budget , if you can get it to work properly, i'll be transferring other jobs concerning oscommerce to you as well. Happy bidding