-20.10 15:33:03 [Server] INFO Stack Trace:
20.10 15:33:03 [Server] INFO java.lang.IllegalArgumentException: Unable to find a field that matches {modifiers=[required: 10000, banned: 1000], type={ type input instanceof interface java.util.Map }}
20.10 15:33:03 [Server] INFO at ProtocolLib.jar//com.comphenix.protocol.reflect.FuzzyReflection.getField(FuzzyReflection.java:352)
20.10 15:33:03 [Server] INFO at ProtocolLib.jar//com.comphenix.protocol.injector.packet.PacketRegistry.createNewRegister(PacketRegistry.java:188)
20.10 15:33:03 [Server] INFO at ProtocolLib.jar//com.comphenix.protocol.injector.packet.PacketRegistry.initialize(PacketRegistry.java:292)
20.10 15:33:03 [Server] INFO at ProtocolLib.jar//com.comphenix.protocol.injector.packet.PacketRegistry.getClientPacketTypes(PacketRegistry.java:327)
20.10 15:33:03 [Server] INFO at ProtocolLib.jar//com.comphenix.protocol.injector.PacketFilterManager.<init>(PacketFilterManager.java:120)
20.10 15:33:03 [Server] INFO at ProtocolLib.jar//com.comphenix.protocol.injector.PacketFilterBuilder.build(PacketFilterBuilder.java:121)
20.10 15:33:03 [Server] INFO at ProtocolLib.jar//com.comphenix.protocol.ProtocolLib.onLoad(ProtocolLib.java:183)
20.10 15:33:03 [Server] INFO at io.papermc.paper.plugin.storage.ServerPluginProviderStorage.processProvided(ServerPluginProviderStorage.java:59)
20.10 15:33:03 [Server] INFO at io.papermc.paper.plugin.storage.ServerPluginProviderStorage.processProvided(ServerPluginProviderStorage.java:18)
20.10 15:33:03 [Server] INFO at io.papermc.paper.plugin.storage.SimpleProviderStorage.enter(SimpleProviderStorage.java:40)
20.10 15:33:03 [Server] INFO at io.papermc.paper.plugin.entrypoint.LaunchEntryPointHandler.enter(LaunchEntryPointHandler.java:36)
20.10 15:33:03 [Server] INFO at org.bukkit.craftbukkit.v1_20_R2.CraftServer.loadPlugins(CraftServer.java:512)
20.10 15:33:03 [Server] INFO at net.minecraft.server.dedicated.DedicatedServer.e(DedicatedServer.java:273)
20.10 15:33:03 [Server] INFO at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:1086)
20.10 15:33:03 [Server] INFO at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:315)
20.10 15:33:03 [Server] INFO at java.base/java.lang.Thread.run(Thread.java:833)
20.10 15:33:03 [Server] INFO Dump:
20.10 15:33:03 [Server] INFO Parameters:
20.10 15:33:03 [Server] INFO [NULL]
20.10 15:33:03 [Server] INFO Sender:
20.10 15:33:03 [Server] INFO com.comphenix.protocol.ProtocolLib@23d56d40[
20.10 15:33:03 [Server] INFO statistics=<null>
20.10 15:33:03 [Server] INFO packetTask=<null>
20.10 15:33:03 [Server] INFO tickCounter=0
20.10 15:33:03 [Multicraft] Skipped 51 lines due to rate limit (50.0/s)

Yea I'm having the same problem too. Sucks to see that your dealing with it. Best of luck man.

same issue (using purpur)

ProtocolLib 5.1.0, which you are probably using, only support Minecraft 1.20.1. For 1.20.2 support, please use the latest development build: https://ci.dmulloy2.net/job/ProtocolLib/669/