Oh, lol, the reason this is happening is because you're not logged in. The wiki has a seperate authentication and so you'll need to create a wiki account. I might add that the validation error message really needs to be more specific about what is going wrong.
In fact, you'll need to be logged in to even edit articles, too. Or are you logged in and you're still having this issue?
In fact, you'll need to be logged in to even edit articles, too. Or are you logged in and you're still having this issue?
I just created this fake page: Diablo_4
Here's how I did it: