Can you tell me why I am getting an error like this? This class is available in NMS. Or am I confusing something?

Maybe you know a similar thing, but only for 1.20?

https://github.com/dmulloy2/PacketWrapper/blob/eb9790ab89a1cc08ec8b1a9c3c5c63174bcdf534/PacketWrapper/src/main/java/com/comphenix/packetwrapper/WrapperPlayServerAdvancements.java#L35

PacketWrapper hasn't been updated in a while. I'm working on remaking it, but that will take time