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Fatal error: Uncaught Error: Class 'Yoast\WP\Lib\Abstract_Main' not found in /homepages/25/d559866892/htdocs/app559909088/wp-content/plugins/wordpress-seo/src/main.php:25 Stack trace: #0 /homepages/25/d559866892/htdocs/app559909088/wp-content/plugins/wordpress-seo/vendor/composer/ClassLoader.php(444): include() #1 /homepages/25/d559866892/htdocs/app559909088/wp-content/plugins/wordpress-seo/vendor/composer/ClassLoader.php(322): Composer\Autoload\includeFile('/homepages/25/d...') #2 [internal function]: Composer\Autoload\ClassLoader->loadClass('Yoast\\WP\\SEO\\Ma...') #3 /homepages/25/d559866892/htdocs/app559909088/wp-content/plugins/wordpress-seo/src/functions.php(35): spl_autoload_call('Yoast\\WP\\SEO\\Ma...') #4 /homepages/25/d559866892/htdocs/app559909088/wp-content/plugins/wordpress-seo/wp-seo-main.php(459): YoastSEO() #5 /homepages/25/d559866892/htdocs/app559909088/wp-content/plugins/wordpress-seo/wp-seo.php(50): require_once('/homepages/25/d...') #6 /homepages/25/d559866892/htdocs/app559909088/wp-settings.php(391): in /homepages/25/d559866892/htdocs/app559909088/wp-content/plugins/wordpress-seo/src/main.php on line 25