I have a problem with loading my website which is made with Prestashop. 4 or 5 months ago it was working fine, but today when I tried to open it it gives the me message "Unable to open file" or sometimes it gives me a server error.
I have already tested a die('999') when the index file is loading. When refreshing it, it gives me the result 999 instead of the message "unable to open the file". I don't know what happened to my website.