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To Reproduce
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3. Scroll down to '....'
4. See error

Expected behavior
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Version Info
Provide your ProtocolLib install info with /protocol dump through pastebin.

Additional context
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[22:37:42] [Server thread/INFO] [com.comphenix.protocol.ProtocolLib]: [ProtocolLib] Enabling ProtocolLib v4.5.1
[22:37:42] [Server thread/INFO] []: Error Cannot enable ProtocolLib. (java.lang.ExceptionInInitializerError) occured in ProtocolLib v4.5.1.
[22:37:42] [Server thread/ERROR] [Minecraft]: [ProtocolLib] INTERNAL ERROR: Cannot enable ProtocolLib.
If this problem hasn't already been reported, please open a ticket
at https://github.com/dmulloy2/ProtocolLib/issues with the following data:
Stack Trace:
java.lang.ExceptionInInitializerError
at com.comphenix.protocol.ProtocolLib.onEnable(ProtocolLib.java:374)
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:256)
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:337)
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:403)
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugin(CraftServer.java:420)
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugins(CraftServer.java:379)
at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:256)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:631)
at java.lang.Thread.run(Unknown Source)
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.entity.EntityLivingBase}],
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.entity.EntityLivingBase instanceof input, Index: 2}, {Type: class net.minecraft.server.MinecraftServer instanceof input, Index: 0}], 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.getNetworkManagerClass(MinecraftReflection.java:1082)
at com.comphenix.protocol.utility.MinecraftReflection.getEnumProtocolClass(MinecraftReflection.java:758)
at com.comphenix.protocol.injector.netty.ProtocolRegistry.(ProtocolRegistry.java:58)
at com.comphenix.protocol.injector.netty.NettyProtocolRegistry.(NettyProtocolRegistry.java:43)
at com.comphenix.protocol.injector.packet.PacketRegistry.initialize(PacketRegistry.java:70)
at com.comphenix.protocol.injector.packet.PacketRegistry.getPacketClassFromType(PacketRegistry.java:271)
at com.comphenix.protocol.utility.ChatExtensions.getJsonFormatConstructor(ChatExtensions.java:218)
at com.comphenix.protocol.utility.ChatExtensions.(ChatExtensions.java:55)
... 9 more
Dump:
Sender:
com.comphenix.protocol.ProtocolLib@7ed705d7[
statistics=
backgroundCompiler=
packetTask=-1
tickCounter=0
unhookTask=com.comphenix.protocol.injector.DelayedSingleTask@1b4f4174
configExpectedMod=-1
updater=com.comphenix.protocol.updater.SpigotUpdater@38bd6b4e
redirectHandler=
commandProtocol=
commandPacket=
commandFilter=
packetLogging=
skipDisable=false
isEnabled=true
loader=org.bukkit.plugin.java.JavaPluginLoader@79a7d73f
server=CraftServer{serverName=Kettle,serverVersion=git-HEAD-a8543ec,minecraftVersion=1.12.2}
file=plugins\ProtocolLib.jar
description=org.bukkit.plugin.PluginDescriptionFile@6f7e9c8e
dataFolder=plugins\ProtocolLib
classLoader=org.bukkit.plugin.java.PluginClassLoader@1fe1edb3
naggable=true
newConfig=YamlConfiguration[path='', root='YamlConfiguration']
configFile=plugins\ProtocolLib\config.yml
logger=org.bukkit.plugin.PluginLogger@5d6fd97a
]
Version:
ProtocolLib v4.5.1
Java Version:
1.8.0_251
Server:
git-HEAD-a8543ec (MC: 1.12.2)

i use kettle

Try one of the latest dev builds