Warning: Failed loading Zend extension 'opcache.so' (tried: /usr/lib/php71/extensions/opcache.so (/usr/lib/php71/extensions/opcache.so: undefined symbol: _zval_ptr_dtor), /usr/lib/php71/extensions/opcache.so.so (/usr/lib/php71/extensions/opcache.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0