Fatal error: Uncaught TypeError: Return value of Composer\Autoload\ClassLoader::initializeIncludeClosure() must be an instance of Composer\Autoload\void, none returned in /home/proline/public_html/wp-content/plugins/meta-box/vendor/composer/ClassLoader.php:580 Stack trace: #0 /home/proline/public_html/wp-content/plugins/meta-box/vendor/composer/ClassLoader.php(112): Composer\Autoload\ClassLoader::initializeIncludeClosure() #1 /home/proline/public_html/wp-content/plugins/meta-box/vendor/composer/autoload_real.php(26): Composer\Autoload\ClassLoader->__construct('/home/proline/p...') #2 /home/proline/public_html/wp-content/plugins/meta-box/vendor/autoload.php(25): ComposerAutoloaderInit66983e14f2631207071f6f30c7c3de9c::getLoader() #3 /home/proline/public_html/wp-content/plugins/meta-box/inc/loader.php(65): require('/home/proline/p...') #4 /home/proline/public_html/wp-content/plugins/meta-box/meta-box.php(19): RWMB_Loader->init() #5 /home/proline/public_html/wp-settings.php(418): include_once('/home/proline/p...') #6 /home/pr in /home/proline/public_html/wp-content/plugins/meta-box/vendor/composer/ClassLoader.php on line 580