Just for a specific customer every time when I tried to modify some Personal Information in the backend(customer section), or if I tried with the same user to access the cart or the checkout page, I receive this error in the browser:
var/log folder I don't have anything related to this issue.
What is really weird is the fact that only for one user this is happening, and unfortunately, i can't delete this user because there are many orders related with.
If i tried to do the same operations with other users everything goes fine.
What i found related to my issue is to try flushing the APC Opcode cache by using:
But when i tried to do this i receive "undefined method" error which means that i don't have PHP APC extension enabled.
Does anyone know what i should do to solve this err?