Fatal error: Uncaught TypeError: Return value of Composer\Autoload\ClassLoader::initializeIncludeClosure() must be an instance of Composer\Autoload\void, none returned in /homepages/8/d415539604/htdocs/wp-content/plugins/meta-box/vendor/composer/ClassLoader.php:580 Stack trace: #0 /homepages/8/d415539604/htdocs/wp-content/plugins/meta-box/vendor/composer/ClassLoader.php(112): Composer\Autoload\ClassLoader::initializeIncludeClosure() #1 /homepages/8/d415539604/htdocs/wp-content/plugins/meta-box/vendor/composer/autoload_real.php(26): Composer\Autoload\ClassLoader->__construct('/homepages/8/d4...') #2 /homepages/8/d415539604/htdocs/wp-content/plugins/meta-box/vendor/autoload.php(25): ComposerAutoloaderInit66983e14f2631207071f6f30c7c3de9c::getLoader() #3 /homepages/8/d415539604/htdocs/wp-content/plugins/meta-box/inc/loader.php(65): require('/homepages/8/d4...') #4 /homepages/8/d415539604/htdocs/wp-content/plugins/meta-box/meta-box.php(19): RWMB_Loader->init() #5 /homepages/8/d415539604/htdocs/wp-settings.php(447): include_onc in /homepages/8/d415539604/htdocs/wp-content/plugins/meta-box/vendor/composer/ClassLoader.php on line 580