What behaviour is observed:

ChangeSkin writes error on Paper 1.17.1.

What behaviour is expected:

ChangeSkin no writes error on Paper 1.17.1.

Steps/models to reproduce:

Use Changeskin on 1.17.1 Paper.

Plugin list:

Plugins (32): Admin-Chat, AuthMe, BetterGUI, ChangeSkin, ChatControlRed, Citizens, CompatNoCheatPlus, ConditionalCommands, CoreProtect, EasySetSpawn, FastLogin, HolographicDisplays, HolographicExtension, ImageMaps, ItemJoin, LPC, LuckPerms, MemoryViewer, Multiverse-Core, NashornPlus, NoCheatPlus, PinPrompt, PlaceholderAPI, PlugMan, ProtocolLib, StaffChat, TAB, Vault, WDLCompanion, WorldBorder, WorldEdit, WorldGuard

Environment description

Waterfall 1.17-R0.1-SNAPSHOT build 445, SQLite.

Plugin version:

ChangeSkin version 3.1-SNAPSHOT-9fa2f2c

Error Log:

https://pastebin.com/vyYt4j8x

Configuration:

https://pastebin.com/BdjjK6nX

Thanks!

Which ProtocolLib version do you use?

4.7.0

Looks more like a bug of ProtocolLib with your Java version. Which one are you using?

Java 16.0.1. The Minecraft 1.17.1 only support Java 16 or newer Java versions.

I reported it, but replaced our usage so it works again.