Hi there, I encountered this error when using ProtocolLib with 1.20.6. This is the first time the plugin is loaded into our server.

[Maaaccccc]

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:183) at ProtocolLib.jar//com.comphenix.protocol.injector.packet.PacketRegistry.initialize(PacketRegistry.java:334) at ProtocolLib.jar//com.comphenix.protocol.injector.packet.PacketRegistry.getClientPacketTypes(PacketRegistry.java:369) 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.CraftServer.loadPlugins(CraftServer.java:532) at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:286) at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1136) 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@64dfdf78[ statistics= packetTask= tickCounter=0 configExpectedMod=-1 updater=com.comphenix.protocol.updater.SpigotUpdater@190c7081 redirectHandler= scheduler=com.comphenix.protocol.scheduler.DefaultScheduler@3b258c7 commandProtocol= commandPacket= commandFilter= packetLogging= skipDisable=false isEnabled=false loader=io.papermc.paper.plugin.manager.DummyBukkitPluginLoader@8b5ce5b server=CraftServer{serverName=Paper,serverVersion=1.20.6-147-e41d44f,minecraftVersion=1.20.6} file=plugins/.paper-remapped/ProtocolLib.jar description=org.bukkit.plugin.PluginDescriptionFile@6555df3e pluginMeta=org.bukkit.plugin.PluginDescriptionFile@6555df3e dataFolder=plugins/ProtocolLib classLoader=PluginClassLoader{plugin=ProtocolLib v5.2.0-SNAPSHOT-679, pluginEnabled=false, url=plugins/.paper-remapped/ProtocolLib.jar} naggable=true newConfig=YamlConfiguration[path='', root='YamlConfiguration'] configFile=plugins/ProtocolLib/config.yml logger=com.destroystokyo.paper.utils.PaperPluginLogger@4fd79b06 lifecycleEventManager=io.papermc.paper.plugin.lifecycle.event.PaperLifecycleEventManager@745f36b4 allowsLifecycleRegistration=true ] Version: ProtocolLib v5.2.0-SNAPSHOT-679 Java Version: 21.0.3 Server: 1.20.6-147-e41d44f (MC: 1.20.6)

[Ingrim4]

Please use the latest dev build and try again: https://ci.dmulloy2.net/job/ProtocolLib/