I have this error in console when i start the server

[13:36:20 ERROR]: [ProtocolLib] INTERNAL ERROR: Cannot enable ProtocolLib.
If this problem hasn't already been reported, please open a ticket
at http://dev.bukkit.org/server-mods/protocollib/ with the following data:
===== STACK TRACE =====
java.lang.ExceptionInInitializerError
at com.comphenix.protocol.ProtocolLibrary.onEnable(ProtocolLibrary.java:355)
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263)
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:370)
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:500)
at org.bukkit.craftbukkit.v1_17_R1.CraftServer.enablePlugin(CraftServer.java:518)
at org.bukkit.craftbukkit.v1_17_R1.CraftServer.enablePlugins(CraftServer.java:432)
at net.minecraft.server.dedicated.DedicatedServer.init(DedicatedServer.java:276)
at net.minecraft.server.MinecraftServer.x(MinecraftServer.java:1118)
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:320)
at java.base/java.lang.Thread.run(Thread.java:831)
Caused by: java.lang.RuntimeException: Cannot find class net.minecraft.world.entity.MinecraftServer
at com.comphenix.protocol.utility.MinecraftReflection.getClass(MinecraftReflection.java:1885)
at com.comphenix.protocol.utility.MinecraftReflection.getMinecraftClass(MinecraftReflection.java:1906)
at com.comphenix.protocol.utility.MinecraftReflection.getMinecraftServerClass(MinecraftReflection.java:945)
at com.comphenix.protocol.utility.MinecraftReflection.getNetServerHandlerClass(MinecraftReflection.java:1041)
at com.comphenix.protocol.utility.MinecraftReflection.getPacketClass(MinecraftReflection.java:714)
at com.comphenix.protocol.injector.packet.LegacyPacketRegistry.getPacketRegistry(LegacyPacketRegistry.java:188)
at com.comphenix.protocol.injector.packet.LegacyPacketRegistry.initialize(LegacyPacketRegistry.java:64)
at com.comphenix.protocol.injector.packet.PacketRegistry.initializeLegacy(PacketRegistry.java:111)
at com.comphenix.protocol.injector.packet.PacketRegistry.initialize(PacketRegistry.java:83)
at com.comphenix.protocol.injector.packet.PacketRegistry.getPacketClassFromType(PacketRegistry.java:356)
at com.comphenix.protocol.utility.ChatExtensions.getJsonFormatConstructor(ChatExtensions.java:218)
at com.comphenix.protocol.utility.ChatExtensions.(ChatExtensions.java:56)
... 10 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.world.entity.MinecraftServer
at org.bukkit.plugin.java.PluginClassLoader.loadClass0(PluginClassLoader.java:146)
at org.bukkit.plugin.java.PluginClassLoader.loadClass(PluginClassLoader.java:103)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:519)
at com.comphenix.protocol.utility.MinecraftReflection.getClass(MinecraftReflection.java:1883)
... 21 more
===== DUMP =====
Sender:
com.comphenix.protocol.ProtocolLibrary@30255c24[
statistics=
backgroundCompiler=
packetTask=-1
tickCounter=0
unhookTask=com.comphenix.protocol.injector.DelayedSingleTask@2d45bfbd
configExpectedMod=-1
logger=com.destroystokyo.paper.utils.PaperPluginLogger@4fa98523
redirectHandler=
commandProtocol=
commandPacket=
commandFilter=
skipDisable=false
isEnabled=true
loader=org.bukkit.plugin.java.JavaPluginLoader@488cdc12
server=CraftServer{serverName=Paper,serverVersion=git-Paper-79,minecraftVersion=1.17}
file=plugins/ProtocolLib.jar
description=org.bukkit.plugin.PluginDescriptionFile@4084baba
dataFolder=plugins/ProtocolLib
classLoader=PluginClassLoader{plugin=ProtocolLib v3.7.0, pluginEnabled=true, url=plugins/ProtocolLib.jar}
naggable=true
newConfig=YamlConfiguration[path='', root='YamlConfiguration']
configFile=plugins/ProtocolLib/config.yml
logger=com.destroystokyo.paper.utils.PaperPluginLogger@4fa98523
]
Version:
ProtocolLib v3.7.0
Server:
git-Paper-79 (MC: 1.17)

ProtocolLib's main release is 4.6.0 iirc (might be 4.7.0 by now). Consider updating the plugin.

I kinda love this actually. 3.7.0 supports 1.7 and 4.7.0 supports 1.17.

Go ahead and grab a dev build: https://ci.dmulloy2.net/job/ProtocolLib