Fatal error: Uncaught Error: Call to undefined method Composer\Autoload\ClassLoader::setClassMapAuthoritative() in /homepages/29/d217113380/htdocs/app490521644/wp-content/plugins/duplicate-post/vendor/composer/autoload_real.php:41 Stack trace: #0 /homepages/29/d217113380/htdocs/app490521644/wp-content/plugins/duplicate-post/vendor/autoload.php(7): ComposerAutoloaderInitb771dd36b1819b8209dfac03b31cc9ed::getLoader() #1 /homepages/29/d217113380/htdocs/app490521644/wp-content/plugins/duplicate-post/duplicate-post.php(50): require('/homepages/29/d...') #2 /homepages/29/d217113380/htdocs/app490521644/wp-settings.php(391): include_once('/homepages/29/d...') #3 /homepages/29/d217113380/htdocs/app490521644/wp-config.php(199): require_once('/homepages/29/d...') #4 /homepages/29/d217113380/htdocs/app490521644/wp-load.php(37): require_once('/homepages/29/d...') #5 /homepages/29/d217113380/htdocs/app490521644/wp-blog-header.php(13): require_once('/homepages/29/d...') #6 /homepages/29/d217113380/htdocs/app490521644/index.php(17): requi in /homepages/29/d217113380/htdocs/app490521644/wp-content/plugins/duplicate-post/vendor/composer/autoload_real.php on line 41