Notice: Undefined variable: thumb in

Hi
I have done searchin and i was not able to find such question asked earlier...
I moved my cart from my root to a subdomain...

i modified 3 things
1) config in root
2) config in admin
3) domain name in admin settings area

but now when i click ona category or a subcategory then I am getting this error..


Notice: Undefined variable: thumb in /home/*********/catalog/view/theme/default/template/product/category.tpl on line 13

before this transfer every thing was working fine..
i backup every file from root on my hard disk and then i again copied it in another subdomain folder...

otherwise it seems to work perfectly...

It could have just been that your error reporting was set to a lower setting on your other server. What version of opencart are you running?