Fatal error: Uncaught Error: Call to undefined function imagewebp() in /var/www/html/img/optimize.php:87 Stack trace: #0 /var/www/html/img/optimize.php(52): optimizeAndServe('/var/www/html/i...', '/var/www/html/i...', 80) #1 {main} thrown in /var/www/html/img/optimize.php on line 87