Fatal error: Uncaught InvalidArgumentException: /var/www/mediawiki/extensions/CreateWiki/extension.json is not a valid JSON file. in /var/www/mediawiki/includes/registration/ExtensionRegistry.php:450 Stack trace: #0 /var/www/mediawiki/includes/registration/ExtensionRegistry.php(330): MediaWiki\Registration\ExtensionRegistry->readFromQueue() #1 /var/www/mediawiki/includes/Setup.php(293): MediaWiki\Registration\ExtensionRegistry->loadFromQueue() #2 /var/www/mediawiki/includes/WebStart.php(85): require_once('...') #3 /var/www/mediawiki/index.php(50): require('...') #4 {main} thrown in /var/www/mediawiki/includes/registration/ExtensionRegistry.php on line 450