Fatal error: Uncaught TypeError: Return value of Composer\Autoload\ClassLoader::initializeIncludeClosure() must be an instance of Composer\Autoload\void, none returned in /www/htdocs/w0170b21/eventusfachschule.de/wp-content/plugins/meta-box/vendor/composer/ClassLoader.php:580
Stack trace:
#0 /www/htdocs/w0170b21/eventusfachschule.de/wp-content/plugins/meta-box/vendor/composer/ClassLoader.php(112): Composer\Autoload\ClassLoader::initializeIncludeClosure()
#1 /www/htdocs/w0170b21/eventusfachschule.de/wp-content/plugins/meta-box/vendor/composer/autoload_real.php(26): Composer\Autoload\ClassLoader->__construct('/www/htdocs/w01...')
#2 /www/htdocs/w0170b21/eventusfachschule.de/wp-content/plugins/meta-box/vendor/autoload.php(25): ComposerAutoloaderInit66983e14f2631207071f6f30c7c3de9c::getLoader()
#3 /www/htdocs/w0170b21/eventusfachschule.de/wp-content/plugins/meta-box/inc/loader.php(65): require('/www/htdocs/w01...')
#4 /www/htdocs/w0170b21/eventusfachschule.de/wp-content/plugins/meta-box/meta-box.php(19): RWMB_Loader->init()
# in /www/htdocs/w0170b21/eventusfachschule.de/wp-content/plugins/meta-box/vendor/composer/ClassLoader.php on line 580