Error

[21:32:45] [Server thread/INFO]: [ProtocolLib] Enabling ProtocolLib v3.4.0
[21:32:45] [Server thread/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.NoClassDefFoundError: Could not initialize class com.comphenix.protocol.utility.ChatExtensions
  	at com.comphenix.protocol.ProtocolLibrary.onEnable(ProtocolLibrary.java:377)
  	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321)
  	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:335)
  	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405)
  	at com.rylinaux.plugman.util.PluginUtil.enable(PluginUtil.java:73)
  	at com.rylinaux.plugman.command.RestartCommand.execute(RestartCommand.java:124)
  	at com.rylinaux.plugman.PlugManCommands.onCommand(PlugManCommands.java:100)
  	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
  	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141)
  	at org.bukkit.craftbukkit.v1_8_R1.CraftServer.dispatchCommand(CraftServer.java:645)
  	at net.minecraft.server.v1_8_R1.PlayerConnection.handleCommand(PlayerConnection.java:1115)
  	at net.minecraft.server.v1_8_R1.PlayerConnection.a(PlayerConnection.java:950)
  	at net.minecraft.server.v1_8_R1.PacketPlayInChat.a(PacketPlayInChat.java:26)
  	at net.minecraft.server.v1_8_R1.PacketPlayInChat.a(PacketPlayInChat.java:53)
  	at net.minecraft.server.v1_8_R1.PacketHandleTask.run(SourceFile:13)
  	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
  	at java.util.concurrent.FutureTask.run(Unknown Source)
  	at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:683)
  	at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:316)
  	at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:623)
  	at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:526)
  	at java.lang.Thread.run(Unknown Source)
            ===== DUMP =====
  Sender:
    com.comphenix.protocol.ProtocolLibrary@74dfa10d[
      statistisc=<null>
      backgroundCompiler=<null>
      packetTask=-1
      tickCounter=0
      unhookTask=com.comphenix.protocol.injector.DelayedSingleTask@68c95487
      configExpectedMod=-1
      updater=com.comphenix.protocol.metrics.Updater@79cca0cf
      logger=org.bukkit.plugin.PluginLogger@6951b481
      redirectHandler=<null>
      commandProtocol=<null>
      commandPacket=<null>
      commandFilter=<null>
      skipDisable=false
      isEnabled=true
      loader=org.bukkit.plugin.java.JavaPluginLoader@7321b72b
      server=CraftServer{serverName=CraftBukkit,serverVersion=git-Spigot-899f5ee-1092acb,minecraftVersion=1.8}
      file=plugins/ProtocolLib.jar
      description=org.bukkit.plugin.PluginDescriptionFile@635415c2
      dataFolder=plugins/ProtocolLib
      classLoader=org.bukkit.plugin.java.PluginClassLoader@7d689408
      naggable=true
      ebean=<null>
      newConfig=YamlConfiguration[path='', root='YamlConfiguration']
      configFile=plugins/ProtocolLib/config.yml
      logger=org.bukkit.plugin.PluginLogger@6951b481
    ]
  Version:
    ProtocolLib v3.4.0
  Server:
    git-Spigot-899f5ee-1092acb (MC: 1.8)

[21:32:45] [Server thread/INFO]: [ProtocolLib] Disabling ProtocolLib v3.4.0