Fatal error: Uncaught Exception: /app/extensions/FmmCompare/extension.json is not a valid JSON file. in /opt/mediawiki/includes/registration/ExtensionRegistry.php:224 Stack trace: #0 /opt/mediawiki/includes/registration/ExtensionRegistry.php(158): ExtensionRegistry->readFromQueue(Array) #1 /opt/mediawiki/includes/Setup.php(116): ExtensionRegistry->loadFromQueue() #2 /opt/mediawiki/includes/WebStart.php(88): require_once('/opt/mediawiki/...') #3 /opt/mediawiki/index.php(39): require('/opt/mediawiki/...') #4 {main} thrown in /opt/mediawiki/includes/registration/ExtensionRegistry.php on line 224