I'm on the most recent version of paper, protocollib, and yamipa. Whenever I run /image download "link" name, it says it downloads it, but when I try to place it, it doesn't place. I tried restarting my server, and it just appeared as a red square.

I'm also getting a repeated error ingame chat:
"Error Unable to intercept a read client packet. java.lang.IllegalArgumentException: Unable to find a field null with the type com.mojang.authlib.GameProfile in net.minecraft.network.protocol.login.PacketLoginInStart) occured in com.comphenix,protocol.injector.netty.ChannelInjector@4e87d445"

I'm running my server on 1.19.2 and on apexhosting, if that matters.

update on this: i was using the wrong version of protocol lib! sorry about that :P