Fatal error: Uncaught Error: Class 'MongoClient' not found in /var/www/crawl_books/mongocrud.php:22 Stack trace: #0 /var/www/html/sentence-dictionary/functions.php(542): db::conn() #1 /var/www/html/sentence-dictionary/index.php(125): getOverview('ruin') #2 {main} thrown in /var/www/crawl_books/mongocrud.php on line 22