Please Help. My Resource Pack Won't Work?

I joined this server recently and the resource pack has never worked. Yes, I enabled resource packs on the server list. It still won't work. I changed it to "prompt" so it asked me, and whenever I said yes it didn't work. When I said yes, in chat it would say "loading resource pack..." and then the class menu would show up with the little dialogue you always get. I don't know if that interferes with it but I really need help. Thank you.

 

Try doing /autojoin, which will skip the class menu.

 

That isn't a command, or it didn't work.

 

It is /toggle autojoin