Fatal error: Uncaught ExtensionDependencyError: DiscussionTools requires Linter to be installed. in /var/www/html/includes/registration/ExtensionRegistry.php:438 Stack trace: #0 /var/www/html/includes/registration/ExtensionRegistry.php(282): ExtensionRegistry->readFromQueue() #1 /var/www/html/includes/Setup.php(282): ExtensionRegistry->loadFromQueue() #2 /var/www/html/includes/WebStart.php(92): require_once('/var/www/html/i...') #3 /var/www/html/index.php(44): require('/var/www/html/i...') #4 {main} thrown in /var/www/html/includes/registration/ExtensionRegistry.php on line 438