Fatal error: Uncaught TypeError: Return value of Composer\Autoload\ClassLoader::initializeIncludeClosure() must be an instance of Composer\Autoload\void, none returned in /wp-content/plugins/meta-box/vendor/composer/ClassLoader.php:580
Stack trace:
#0 /wp-content/plugins/meta-box/vendor/composer/ClassLoader.php(112): Composer\Autoload\ClassLoader::initializeIncludeClosure()
#1 /wp-content/plugins/meta-box/vendor/composer/autoload_real.php(26): Composer\Autoload\ClassLoader->__construct('/wp-content/plu...')
#2 /wp-content/plugins/meta-box/vendor/autoload.php(25): ComposerAutoloaderInit66983e14f2631207071f6f30c7c3de9c::getLoader()
#3 /wp-content/plugins/meta-box/inc/loader.php(65): require('/wp-content/plu...')
#4 /wp-content/plugins/meta-box/meta-box.php(19): RWMB_Loader->init()
#5 /wp-settings.php(428): include_once('/wp-content/plu...')
#6 /wp-config.php(104): require_once('/wp-settings.ph...')
#7 /wp-load.php(50): require_once('/wp-config.php')
#8 /wp-blog-header.php(13): require_once('/wp-load.php')
#9 /index.php(17): in /wp-content/plugins/meta-box/vendor/composer/ClassLoader.php on line 580