Fatal error: Uncaught RuntimeException: The configuration setting 'wgCaptchaClass' was already set by MediaWiki core or another extension, and cannot be set again by QuestyCaptcha. in /var/www/mediawiki.testing/core/includes/registration/ExtensionProcessor.php:520 Stack trace: #0 /var/www/mediawiki.testing/core/includes/registration/ExtensionProcessor.php(473): ExtensionProcessor->addConfigGlobal('wgCaptchaClass', 'QuestyCaptcha', 'QuestyCaptcha') #1 /var/www/mediawiki.testing/core/includes/registration/ExtensionProcessor.php(224): ExtensionProcessor->extractConfig1(Array) #2 /var/www/mediawiki.testing/core/includes/registration/ExtensionRegistry.php(271): ExtensionProcessor->extractInfo('/var/www/mediaw...', Array, 1) #3 /var/www/mediawiki.testing/core/includes/registration/ExtensionRegistry.php(161): ExtensionRegistry->readFromQueue(Array) #4 /var/www/mediawiki.testing/core/includes/Setup.php(125): ExtensionRegistry->loadFromQueue() #5 /var/www/mediawiki.testing/core/includes/WebStart.php(77): require_once('/var/www/med in /var/www/mediawiki.testing/core/includes/registration/ExtensionProcessor.php on line 520