XF 1.5 "You must select forum" Error

[Maewefge]

I've recently been moving some nodes around on my forum page, and one of the staff just noticed that with some of the forums, you cant actually make any posts. When you press "submit", it gives you an error saying:

"THE FOLLOWING ERROR OCCURRED: You must select forum."

 

[Paul B]

How did you move the nodes around?

Do you have any add-ons installed?
Does the error still occur with all add-ons disabled?

 

[Maewefge]

Thank you for your help, there was an add-on that was outdated installed along with the one that was updated. Derp on my part .