Fatal error: Uncaught Error: Undefined constant "Patchwork\Utf8\MB_OVERLOAD_STRING" in /home/karabro/test.bahnflow.se/phpBB3/vendor/patchwork/utf8/src/Patchwork/Utf8/Bootup.php:45 Stack trace: #0 /home/karabro/test.bahnflow.se/phpBB3/includes/utf/utf_tools.php(28): Patchwork\Utf8\Bootup::initMbstring() #1 /home/karabro/test.bahnflow.se/phpBB3/common.php(97): require('/home/karabro/t...') #2 /home/karabro/test.bahnflow.se/phpBB3/index.php(23): include('/home/karabro/t...') #3 {main} thrown in /home/karabro/test.bahnflow.se/phpBB3/vendor/patchwork/utf8/src/Patchwork/Utf8/Bootup.php on line 45