Hi
I have the following problem, the shop has been working fine but suddenly it throws up this error I also get 1054 error when I try and enter the admin area. Presumably it has something to do with product catergories Can anyone please tell me how I can fix the problem ?

"1054 Unknown column 'c.parent_id' in 'where clause'
in:
[select cd.categories_name from categories c, categories_description cd where c.parent_id = 0 and c.categories_id = cd.categories_id and cd.language_id='1' and c.categories_status=1]"
Many Thanks