Hello.
I have problem while making a page in a wiki, this happened to me on utau.wiki
After I finished typing details on the page I wanted to make on the wiki and hit save, after like 3-5 minutes this error occured:

My internet connection is totally fine, I've checked it twice and no errors, every person in my house says that they have internet connection on their phones and laptops. I've tried making the site again. But it didn't help. I'm searching for an answer to solve this error.