Stack Trace:
FieldAccessException: Unable to find a field that matches {modifiers=[required: 0, banned: 0], type={
fields=[{modifiers=[required: 0, banned: 0], type=Exact class net.minecraft.world.entity.EntityLiving}],
methods=[{modifiers=[required: 0, banned: 0], params=[{Type: Exact class java.lang.String, Index: null}], paramCount=1}],
constructors=[{modifiers=[required: 0, banned: 0], params=[{Type: class net.minecraft.server.dedicated.DedicatedServer instanceof input, Index: 0}, {Type: class net.minecraft.world.entity.EntityLiving instanceof input, Index: 2}], paramCount=3}]
}}. Workaround failed too.
at com.comphenix.protocol.injector.packet.ProxyPacketInjector.initialize(ProxyPacketInjector.java:191)
at com.comphenix.protocol.injector.packet.ProxyPacketInjector.(ProxyPacketInjector.java:164)
at com.comphenix.protocol.injector.packet.PacketInjectorBuilder.buildInjector(PacketInjectorBuilder.java:94)
at com.comphenix.protocol.injector.PacketFilterManager.(PacketFilterManager.java:259)
at com.comphenix.protocol.injector.PacketFilterBuilder.buildInternal(PacketFilterBuilder.java:250)
at com.comphenix.protocol.injector.PacketFilterBuilder.build(PacketFilterBuilder.java:233)
at com.comphenix.protocol.ProtocolLib.onLoad(ProtocolLib.java:213)
at org.bukkit.craftbukkit.v1_17_R1.CraftServer.loadPlugins(CraftServer.java:387)
at net.minecraft.server.dedicated.DedicatedServer.init(DedicatedServer.java:226)
at net.minecraft.server.MinecraftServer.x(MinecraftServer.java:964)
at net.minecraft.server.MinecraftServer.lambda$0(MinecraftServer.java:297)
at java.base/java.lang.Thread.run(Thread.java:831)
Caused by: java.lang.IllegalArgumentException: Unable to find a field that matches {modifiers=[required: 0, banned: 0], type={
fields=[{modifiers=[required: 0, banned: 0], type=Exact class net.minecraft.world.entity.EntityLiving}],
methods=[{modifiers=[required: 0, banned: 0], params=[{Type: Exact class java.lang.String, Index: null}], paramCount=1}],
constructors=[{modifiers=[required: 0, banned: 0], params=[{Type: class net.minecraft.server.dedicated.DedicatedServer instanceof input, Index: 0}, {Type: class net.minecraft.world.entity.EntityLiving instanceof input, Index: 2}], paramCount=3}]
}}
at com.comphenix.protocol.reflect.FuzzyReflection.getField(FuzzyReflection.java:460)
at com.comphenix.protocol.utility.MinecraftReflection.getPlayerConnectionClass(MinecraftReflection.java:1065)
at com.comphenix.protocol.utility.MinecraftReflection.getPacketClass(MinecraftReflection.java:729)
at com.comphenix.protocol.injector.packet.ProxyPacketInjector$ArrayLookup.initialize(ProxyPacketInjector.java:115)
at com.comphenix.protocol.injector.packet.ProxyPacketInjector$ArrayLookup.(ProxyPacketInjector.java:106)
at com.comphenix.protocol.injector.packet.ProxyPacketInjector.initialize(ProxyPacketInjector.java:188)
... 11 more
Dump:
Parameters:
[NULL]
Sender:
com.comphenix.protocol.ProtocolLib@48681025[
statistics=
backgroundCompiler=
packetTask=-1
tickCounter=0
unhookTask=com.comphenix.protocol.injector.DelayedSingleTask@602c35ee
configExpectedMod=-1
updater=com.comphenix.protocol.updater.BukkitUpdater@4f083098
redirectHandler=
commandProtocol=
commandPacket=
commandFilter=
packetLogging=
skipDisable=false
isEnabled=false
loader=org.bukkit.plugin.java.JavaPluginLoader@244575f2
server=CraftServer{serverName=CraftBukkit,serverVersion=3170-Bukkit-ec116f6,minecraftVersion=1.17}
file=plugins/ProtocolLib.jar
description=org.bukkit.plugin.PluginDescriptionFile@5313e04f
dataFolder=plugins/ProtocolLib
classLoader=org.bukkit.plugin.java.PluginClassLoader@a50e545
naggable=true
newConfig=YamlConfiguration[path='', root='YamlConfiguration']
configFile=plugins/ProtocolLib/config.yml
logger=org.bukkit.plugin.PluginLogger@5c935abc
]
Version:
ProtocolLib v4.5.1
Java Version:
16.0.1
Server:
3170-Bukkit-ec116f6 (MC: 1.17)

The version you are using does not support either Java 16 or Minecraft 1.17. If you want to run on 1.17, you'll have to upgrade to version 4.7.0: https://github.com/dmulloy2/ProtocolLib/releases/tag/4.7.0

[ProtocolLib] INTERNAL ERROR: Cannot find listener thread in MinecraftServer.
Stack Trace:
java.lang.IllegalArgumentException: Unable to find a field that matches {modifiers=[required: 0, banned: 0], type={
fields=[{modifiers=[required: 0, banned: 0], type=Exact class net.minecraft.world.entity.EntityLiving}],
methods=[{modifiers=[required: 0, banned: 0], params=[{Type: Exact class java.lang.String, Index: null}], paramCount=1}],
constructors=[{modifiers=[required: 0, banned: 0], params=[{Type: class net.minecraft.server.dedicated.DedicatedServer instanceof input, Index: 0}, {Type: class net.minecraft.world.entity.EntityLiving instanceof input, Index: 2}], paramCount=3}]
}}
at com.comphenix.protocol.reflect.FuzzyReflection.getField(FuzzyReflection.java:460)
at com.comphenix.protocol.utility.MinecraftReflection.getPlayerConnectionClass(MinecraftReflection.java:1065)
at com.comphenix.protocol.utility.MinecraftReflection.getNetworkListenThreadClass(MinecraftReflection.java:1576)
at com.comphenix.protocol.injector.player.InjectedServerConnection.initializeListenerField(InjectedServerConnection.java:194)
at com.comphenix.protocol.injector.player.InjectedServerConnection.injectListenerThread(InjectedServerConnection.java:232)
at com.comphenix.protocol.injector.player.InjectedServerConnection.injectList(InjectedServerConnection.java:181)
at com.comphenix.protocol.injector.player.ProxyPlayerInjectionHandler.(ProxyPlayerInjectionHandler.java:150)
at com.comphenix.protocol.injector.player.PlayerInjectorBuilder.buildHandler(PlayerInjectorBuilder.java:139)
at com.comphenix.protocol.injector.PacketFilterManager.(PacketFilterManager.java:253)
at com.comphenix.protocol.injector.PacketFilterBuilder.buildInternal(PacketFilterBuilder.java:250)
at com.comphenix.protocol.injector.PacketFilterBuilder.build(PacketFilterBuilder.java:233)
at com.comphenix.protocol.ProtocolLib.onLoad(ProtocolLib.java:213)
at org.bukkit.craftbukkit.v1_17_R1.CraftServer.loadPlugins(CraftServer.java:387)
at net.minecraft.server.dedicated.DedicatedServer.init(DedicatedServer.java:226)
at net.minecraft.server.MinecraftServer.x(MinecraftServer.java:964)
at net.minecraft.server.MinecraftServer.lambda$0(MinecraftServer.java:297)
at java.base/java.lang.Thread.run(Thread.java:831)