"access denied" message

I tried to create a thread with a kvm tag.
When I clicked “Create Topic” an “access denied” message was displayed.
Obviously that didn’t happen with this post.

What could be causing the “access denied” message?

What category did you have selected when you tried to create the new topic?

The category was “Discussion in English”.

I don’t think you can post in that category. You need to use one of the subcategories.

There is a message about that at the top of the category page.