Stack Trace:
java.lang.IllegalArgumentException: Unable to find a field that matches {modifiers=[required: 10000, banned: 1000], type={ type input instanceof interface java.util.Map }}
at ProtocolLib.jar//com.comphenix.protocol.reflect.FuzzyReflection.getField(FuzzyReflection.java:352)
at ProtocolLib.jar//com.comphenix.protocol.injector.packet.PacketRegistry.createNewRegister(PacketRegistry.java:188)
at ProtocolLib.jar//com.comphenix.protocol.injector.packet.PacketRegistry.initialize(PacketRegistry.java:292)
at ProtocolLib.jar//com.comphenix.protocol.injector.packet.PacketRegistry.getClientPacketTypes(PacketRegistry.java:327)
at ProtocolLib.jar//com.comphenix.protocol.injector.PacketFilterManager.(PacketFilterManager.java:120)
at ProtocolLib.jar//com.comphenix.protocol.injector.PacketFilterBuilder.build(PacketFilterBuilder.java:121)
at ProtocolLib.jar//com.comphenix.protocol.ProtocolLib.onLoad(ProtocolLib.java:183)
at io.papermc.paper.plugin.storage.ServerPluginProviderStorage.processProvided(ServerPluginProviderStorage.java:59)
at io.papermc.paper.plugin.storage.ServerPluginProviderStorage.processProvided(ServerPluginProviderStorage.java:18)
at io.papermc.paper.plugin.storage.SimpleProviderStorage.enter(SimpleProviderStorage.java:39)
at io.papermc.paper.plugin.entrypoint.LaunchEntryPointHandler.enter(LaunchEntryPointHandler.java:36)
at org.bukkit.craftbukkit.v1_20_R3.CraftServer.loadPlugins(CraftServer.java:521)
at org.bukkit.craftbukkit.v1_20_R3.CraftServer.reload(CraftServer.java:1129)
at org.bukkit.Bukkit.reload(Bukkit.java:1024)
at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:54)
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:168)
at org.bukkit.craftbukkit.v1_20_R3.CraftServer.dispatchCommand(CraftServer.java:1013)
at org.bukkit.craftbukkit.v1_20_R3.CraftServer.dispatchServerCommand(CraftServer.java:998)
at net.minecraft.server.dedicated.DedicatedServer.bk(DedicatedServer.java:541)
at net.minecraft.server.dedicated.DedicatedServer.b(DedicatedServer.java:488)
at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:1558)
at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:1246)
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:323)
at java.base/java.lang.Thread.run(Thread.java:1583)
Dump:
Parameters:
[NULL]
Sender:
com.comphenix.protocol.ProtocolLib@2f483c3a[
statistics=
packetTask=
tickCounter=0
configExpectedMod=-1
updater=com.comphenix.protocol.updater.SpigotUpdater@45bdc36f
redirectHandler=
scheduler=com.comphenix.protocol.scheduler.DefaultScheduler@2b7a8e0e
commandProtocol=
commandPacket=
commandFilter=
packetLogging=
skipDisable=false
isEnabled=false
loader=io.papermc.paper.plugin.manager.DummyBukkitPluginLoader@4e7a82a1
server=CraftServer{serverName=Purpur,serverVersion=git-Purpur-2160,minecraftVersion=1.20.4}
file=plugins\ProtocolLib.jar
description=org.bukkit.plugin.PluginDescriptionFile@715c9a4b
pluginMeta=org.bukkit.plugin.PluginDescriptionFile@715c9a4b
dataFolder=plugins\ProtocolLib
classLoader=PluginClassLoader{plugin=ProtocolLib v5.1.0, pluginEnabled=false, url=plugins\ProtocolLib.jar}
naggable=true
newConfig=YamlConfiguration[path='', root='YamlConfiguration']
configFile=plugins\ProtocolLib\config.yml
logger=com.destroystokyo.paper.utils.PaperPluginLogger@61dc6936
lifecycleEventManager=io.papermc.paper.plugin.lifecycle.event.PaperLifecycleEventManager@32516a15
allowsLifecycleRegistration=true
]
Version:
ProtocolLib v5.1.0
Java Version:
21.0.2
Server:
git-Purpur-2160 (MC: 1.20.4)

try latest version from https://ci.dmulloy2.net/job/protocollib/
[ProtocolLib] Enabling ProtocolLib v5.2.0-SNAPSHOT-679