Can't access product/module in B-O

[Skipea]

Hello ,

I started working on a webhosted 1.7 Prestashop, and decided to move it on localhost.

Pretty much everything seems to work at first but when I clik on the product or module page in Back Office I stumble upon an error 500 page.

Where could this come from ? 

I basically moved everything through filezilla from my host to my computer, and did all the setup to log into it within localhost.