Kdyby\Doctrine\ReadOnlyCollectionException::invalidAccess PHP Method

    public static function invalidAccess($what)
    {
        return new static('Could not ' . $what . ' read-only collection, write/modify operations are forbidden.');
    }

 /**
  * {@inheritdoc}
  * @throws ReadOnlyCollectionException
  */
 public function offsetUnset($offset)
 {
     throw ReadOnlyCollectionException::invalidAccess('remove an element from');
 }