Fatal error: Uncaught Exception: Unable to open file /var/www/html/extensions/SimpleMathJax/extension.json: filemtime(): stat failed for /var/www/html/extensions/SimpleMathJax/extension.json in /var/www/html/includes/registration/ExtensionRegistry.php:185 Stack trace: #0 /var/www/html/includes/GlobalFunctions.php(51): ExtensionRegistry->queue('/var/www/html/e...') #1 /var/www/html/LocalSettings.php(203): wfLoadExtension('SimpleMathJax') #2 /var/www/html/includes/Setup.php(143): require_once('/var/www/html/L...') #3 /var/www/html/includes/WebStart.php(89): require_once('/var/www/html/i...') #4 /var/www/html/api.php(43): require('/var/www/html/i...') #5 {main} thrown in /var/www/html/includes/registration/ExtensionRegistry.php on line 185