Fatal error: Uncaught TypeError: Return value of Composer\Autoload\ClassLoader::initializeIncludeClosure() must be an instance of Composer\Autoload\void, none returned in /www/htdocs/w011b4be/neuewebsite2017/wp-content/plugins/flexible-shipping/vendor/composer/ClassLoader.php:580 Stack trace: #0 /www/htdocs/w011b4be/neuewebsite2017/wp-content/plugins/flexible-shipping/vendor/composer/ClassLoader.php(112): Composer\Autoload\ClassLoader::initializeIncludeClosure() #1 /www/htdocs/w011b4be/neuewebsite2017/wp-content/plugins/flexible-shipping/vendor/composer/autoload_real.php(26): Composer\Autoload\ClassLoader->__construct('/www/htdocs/w01...') #2 /www/htdocs/w011b4be/neuewebsite2017/wp-content/plugins/flexible-shipping/vendor/autoload.php(25): ComposerAutoloaderInit65ac2d2bd8a17abc2040f39455dc437a::getLoader() #3 /www/htdocs/w011b4be/neuewebsite2017/wp-content/plugins/flexible-shipping/flexible-shipping.php(36): require_once('/www/htdocs/w01...') #4 /www/htdocs/w011b4be/neuewebsite2017/wp-settings.php(447): include_once('/www in /www/htdocs/w011b4be/neuewebsite2017/wp-content/plugins/flexible-shipping/vendor/composer/ClassLoader.php on line 580