so i was playing Not awsome 2 realms and more but its says turn of custom blocks however i did not turn on custom blocks

Are 'allow custom blocks' and 'use CPE' both set to on in Nostalgia Options?

Both buttons must be ON, otherwise you won't be able to connect to that server as it heavily depends on using custom blocks.

but its stuck on the loading screen.

 

You're getting automatically kicked from the server because you turned custom blocks off - because of the way this game is written though, sometimes it won't actually show the kick message.

oh ok.