Fatal error: Uncaught TypeError: flock(): Argument #1 ($stream) must be of type resource, bool given in /htdocs/mittwoch/belegung.php:29 Stack trace: #0 /htdocs/mittwoch/belegung.php(29): flock(false, 2) #1 {main} thrown in /htdocs/mittwoch/belegung.php on line 29