特此来求助，就是下面的这段不断刷屏：[19:56:48] [Server thread/WARN]: [ProtocolLib] Encountered a LinkageError. Make sure you're not using this jar for multi
ple server instances!
[19:56:48] [Server thread/WARN]: [ProtocolLib] If you're getting this error for other reasons, please report it!
[19:56:48] [Server thread/WARN]: java.lang.NoClassDefFoundError: Could not initialize class com.comphenix.protocol.event
s.PacketContainer
[19:56:48] [Server thread/WARN]:        at com.comphenix.protocol.injector.netty.ProtocolInjector.onPacketSending(Protoc
olInjector.java:297)
[19:56:48] [Server thread/WARN]:        at com.comphenix.protocol.injector.netty.ChannelInjector.processSending(ChannelI
njector.java:364)
[19:56:48] [Server thread/WARN]:        at com.comphenix.protocol.injector.netty.ChannelInjector.access$800(ChannelInjec
tor.java:63)
[19:56:48] [Server thread/WARN]:        at com.comphenix.protocol.injector.netty.ChannelInjector$3.handleScheduled(Chann
elInjector.java:329)
[19:56:48] [Server thread/WARN]:        at com.comphenix.protocol.injector.netty.ChannelInjector$3.onMessageScheduled(Ch
annelInjector.java:299)
[19:56:48] [Server thread/WARN]:        at com.comphenix.protocol.injector.netty.ChannelProxy$2.schedulingRunnable(Chann
elProxy.java:127)
[19:56:48] [Server thread/WARN]:        at com.comphenix.protocol.injector.netty.EventLoopProxy.execute(EventLoopProxy.j
ava:95)
[19:56:48] [Server thread/WARN]:        at net.minecraft.network.NetworkManager.func_150732_b(NetworkManager.java:198)
[19:56:48] [Server thread/WARN]:        at net.minecraft.network.NetworkManager.func_179290_a(NetworkManager.java:149)
[19:56:48] [Server thread/WARN]:        at net.minecraft.network.NetHandlerPlayServer.func_147359_a(NetHandlerPlayServer
.java:1336)
[19:56:48] [Server thread/WARN]:        at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher$1.func_1473
59_a(NetworkDispatcher.java:214)
[19:56:48] [Server thread/WARN]:        at net.minecraft.server.management.PlayerList.func_72374_b(PlayerList.java:1312)

[19:56:48] [Server thread/WARN]:        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:939)
[19:56:48] [Server thread/WARN]:        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.j
ava:472)
[19:56:48] [Server thread/WARN]:        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:778)
[19:56:48] [Server thread/WARN]:        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:632)
[19:56:48] [Server thread/WARN]:        at java.lang.Thread.run(Unknown Source)

也许是版本不对？试试这个？ ProtocolLib v4.5.0

请先确定您不是在群组服务器的插件文件夹里安装的这个插件。

1.https://www.spigotmc.org/resources/protocollib.1997/
尝试使用最新版本4.5.0，官方支持1.12

2.如果不影响使用也可使用本插件屏蔽
http://www.mcbbs.net/thread-912870-1-1.html
http://dev.bukkit.org/bukkit-plugins/console-spam-fix/

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测试不影响实际使用仅仅为报错，使用的为猫端非群组服，尝试更换4.3版本无报错，但4.3版本与其余插件冲突=.= 你的方法我试一下有效 谢谢