Drupal 8 need help with Opcode Caching

Hi,

when i activate opcache i get this error:

The website encountered an unexpected error. Please try again later.

i tried several methods to activate error reporting but nothing worked. I need your help to show the error and solve the problem/s and activate opcaching

best,

Drupal version: 


Source: https://www.drupal.org/taxonomy/term/51/feed