如果进入服务器输入命令的话（如gamemode 1）就会提示“插件冲突”
（an internal error occurred while attemoting to perform this command）
以下是后台信息:
[18:39:15] [Server thread/信息]:Dream_cold_ issued server command: /gamemode 1
[18:39:15] [Server thread/ERROR]:null
org.bukkit.command.CommandException: Unhandled exception executing command 'gamemode' in plugin
Essentials v2.13.1
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[PluginCommand.class:git-
Spigot-dcd1643-e60fc34]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~
[SimpleCommandMap.class:git-Spigot-dcd1643-e60fc34]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:702) ~
[CraftServer.class:git-Spigot-dcd1643-e60fc34]
at net.minecraft.network.NetHandlerPlayServer.func_147361_d(NetHandlerPlayServer.java:1591)
[pa.class:?]
at net.minecraft.network.NetHandlerPlayServer.func_147354_a(NetHandlerPlayServer.java:1436)
[pa.class:?]
at net.minecraft.network.play.client.CPacketChatMessage.func_148833_a(SourceFile:37) [la.class:?]
at net.minecraft.network.play.client.CPacketChatMessage.func_148833_a(SourceFile:9) [la.class:?]
at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) [hv$1.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_121]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_121]
at net.minecraft.util.Util.func_181617_a(Util.java:50) [h.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:846)
[MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:472)
[nz.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:783)
[MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:637) [MinecraftServer.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_121]
Caused by: java.lang.NullPointerException
at com.earth2me.essentials.Essentials.onCommandEssentials(Essentials.java:389) ~[?:?]
at com.earth2me.essentials.Essentials.onCommand(Essentials.java:380) ~[?:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[PluginCommand.class:git-
Spigot-dcd1643-e60fc34]
... 15 more
而且服务器的插件列表中只有ess本体插件（没有扩展）
（an internal error occurred while attemoting to perform this command）
以下是后台信息:
[18:39:15] [Server thread/信息]:Dream_cold_ issued server command: /gamemode 1
[18:39:15] [Server thread/ERROR]:null
org.bukkit.command.CommandException: Unhandled exception executing command 'gamemode' in plugin
Essentials v2.13.1
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[PluginCommand.class:git-
Spigot-dcd1643-e60fc34]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~
[SimpleCommandMap.class:git-Spigot-dcd1643-e60fc34]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:702) ~
[CraftServer.class:git-Spigot-dcd1643-e60fc34]
at net.minecraft.network.NetHandlerPlayServer.func_147361_d(NetHandlerPlayServer.java:1591)
[pa.class:?]
at net.minecraft.network.NetHandlerPlayServer.func_147354_a(NetHandlerPlayServer.java:1436)
[pa.class:?]
at net.minecraft.network.play.client.CPacketChatMessage.func_148833_a(SourceFile:37) [la.class:?]
at net.minecraft.network.play.client.CPacketChatMessage.func_148833_a(SourceFile:9) [la.class:?]
at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) [hv$1.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_121]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_121]
at net.minecraft.util.Util.func_181617_a(Util.java:50) [h.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:846)
[MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:472)
[nz.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:783)
[MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:637) [MinecraftServer.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_121]
Caused by: java.lang.NullPointerException
at com.earth2me.essentials.Essentials.onCommandEssentials(Essentials.java:389) ~[?:?]
at com.earth2me.essentials.Essentials.onCommand(Essentials.java:380) ~[?:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[PluginCommand.class:git-
Spigot-dcd1643-e60fc34]
... 15 more
而且服务器的插件列表中只有ess本体插件（没有扩展）
检查一下你的ess插件是不是兼容你的服务器版本