Database created and errors fixed for existing running website...

I have a fully-functioning, running website. I re-designed the looks of the site and also switched hosting companies. When I switched hosting companies, I failed to backup my databases, so now a few things are not working correctly. This is a site for restaurants. People can search by name, city. View profiles, place orders, make reservations, etc. There is a super-admin panel for me. And, a restaurant owner admin panel. The errors are: In the super-admin panel, When I try to edit a restaurant and then click the submit button... i get an error. Also, when I add a restaurant and click submit it goes to a blank white page. (although it does add the restaurant) On the main page... the restaurant login page isn't working. the reserve function on main page, should pull the restaurants that have reservations "on" but that's not working either. The restaurant owner admin panel... I cannot get into it to see what is working and what needs fixed. *There may be other small fixes as well.