I posted before but I haven't really gotten an answer besides closed threads etc. I can't install addons at all, always an invalid class error. Why is this? I installed xenforo twice, did a file check so I'm not missing any files or anything. It does this for every addon I try to install.
Something like this:
Callback Andy_NewPosts_Listener::Forum is invalid (Invalid Class).
I really need assistance because I did not pay for this kind of nonsense. It's always invalid class error.