[19:00:22 WARN]: java.lang.IllegalArgumentException: Multiple entries with same key: Enchantment[21, LOOT_BONUS_MOBS]=3 and Enchantment[21, LOOT_BONUS_MOBS]=3

[19:00:22 WARN]:        at com.google.common.collect.ImmutableMap.checkNoConflict(ImmutableMap.java:150)

[19:00:22 WARN]:        at com.google.common.collect.RegularImmutableMap.checkNoConflictInBucket(RegularImmutableMap.java:104)

[19:00:22 WARN]:        at com.google.common.collect.RegularImmutableMap.<init>(RegularImmutableMap.java:70)

[19:00:22 WARN]:        at com.google.common.collect.ImmutableMap$Builder.build(ImmutableMap.java:254)

[19:00:22 WARN]:        at org.bukkit.craftbukkit.v1_7_R4.inventory.CraftItemStack.getEnchantments(CraftItemStack.java:301)

[19:00:22 WARN]:        at org.bukkit.craftbukkit.v1_7_R4.inventory.CraftItemStack.getEnchantments(CraftItemStack.java:282)

[19:00:22 WARN]:        at fr.xephi.authme.cache.backup.FileCache.createCache(FileCache.java:58)

[19:00:22 WARN]:        at fr.xephi.authme.listener.AuthMePlayerListener.onPlayerJoin(AuthMePlayerListener.java:635)

[19:00:22 WARN]:        at sun.reflect.GeneratedMethodAccessor339.invoke(Unknown Source)

[19:00:22 WARN]:        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

[19:00:22 WARN]:        at java.lang.reflect.Method.invoke(Unknown Source)

[19:00:22 WARN]:        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:334)

[19:00:22 WARN]:        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)

[19:00:22 WARN]:        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:507)

[19:00:22 WARN]:        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:492)

[19:00:22 WARN]:        at net.minecraft.server.management.ServerConfigurationManager.func_72377_c(ServerConfigurationManager.java:362)

[19:00:22 WARN]:        at net.minecraft.server.management.ServerConfigurationManager.initializeConnectionToPlayer(ServerConfigurationManager.java:217)

[19:00:22 WARN]:        at cpw.mods.fml.common.network.handshake.NetworkDispatcher.completeServerSideConnection(NetworkDispatcher.java:190)

[19:00:22 WARN]:        at cpw.mods.fml.common.network.handshake.NetworkDispatcher.completeHandshake(NetworkDispatcher.java:465)

[19:00:22 WARN]:        at cpw.mods.fml.common.network.internal.HandshakeCompletionHandler.channelRead0(HandshakeCompletionHandler.java:21)

[19:00:22 WARN]:        at cpw.mods.fml.common.network.internal.HandshakeCompletionHandler.channelRead0(HandshakeCompletionHandler.java:11)

[19:00:22 WARN]:        at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:98)

[19:00:22 WARN]:        at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337)

[19:00:22 WARN]:        at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323)

[19:00:22 WARN]:        at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)

[19:00:22 WARN]:        at io.netty.handler.codec.MessageToMessageCodec.channelRead(MessageToMessageCodec.java:111)

[19:00:22 WARN]:        at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337)

[19:00:22 WARN]:        at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323)

[19:00:22 WARN]:        at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:785)

[19:00:22 WARN]:        at io.netty.channel.embedded.EmbeddedChannel.writeInbound(EmbeddedChannel.java:169)

[19:00:22 WARN]:        at cpw.mods.fml.common.network.internal.FMLProxyPacket.func_148833_a(FMLProxyPacket.java:77)

[19:00:22 WARN]:        at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:244)

[19:00:22 WARN]:        at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:173)

[19:00:22 WARN]:        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:976)

[19:00:22 WARN]:        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:431)

[19:00:22 WARN]:        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:811)

[19:00:22 WARN]:        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:671)

[19:00:22 WARN]:        at java.lang.Thread.run(Unknown Source)

有时候会清空玩家背包  求助什么问题  解决方法

求助  有时候清空玩家背包   插件   authme

请更新至最新版本试试，确定是 Authme 问题么？
最好能提供更多消息

你用的是数据库储存吗？

没有用数据库储存

他报错就提示的这个 全都截下来了