Fatal error: Uncaught Error: Class 'WP_Upgrader' not found in /home/refref/public_html/wp-post-to-pdf-enhanced-cache-20250414195233/wordfence/wp-post-to-pdf-enhanced-cache/class-language-pack-upgrader-20250420021211.php:19 Stack trace: #0 {main} thrown in /home/refref/public_html/wp-post-to-pdf-enhanced-cache-20250414195233/wordfence/wp-post-to-pdf-enhanced-cache/class-language-pack-upgrader-20250420021211.php on line 19