Board Thread:Support Requests - Getting Technical/@comment-33116956-20170916161546/@comment-9605025-20170916231222

Saftzie is correct, it would be a better idea to ask on the French site. That being said, your question is pretty simple to understand. The error you are getting occurs every so often. There are multiple potential reasons including temporary issues with Wikia's servers. However, the most common solution is to logout of your account, wait a few minutes, and log back in.