Bukkit ArtMailBox —— 为服务器的物品发放增加邮箱吧[1.12.2-1.15.2] 1.0

[Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'artmail' in plugin ArtMailBox v1.0-SNAPSHOT
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[PluginCommand.class:git-CatServer-1.12.2-5a600445]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:146) ~[SimpleCommandMap.class:git-CatServer-1.12.2-5a600445]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:712) ~[CraftServer.class:git-CatServer-1.12.2-5a600445]
at net.minecraft.network.NetHandlerPlayServer.func_147361_d(NetHandlerPlayServer.java:1669) [pa.class:?]
at net.minecraft.network.NetHandlerPlayServer.func_147354_a(NetHandlerPlayServer.java:1470) [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_281]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_281]
at net.minecraft.util.Util.func_181617_a(SourceFile:46) [h.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:902) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:475) [nz.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:828) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:687) [MinecraftServer.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_281]
Caused by: java.lang.NullPointerException
at MySql.MySql.getMailList(MySql.java:116) ~[?:?]
at MySql.MySql.loadMail(MySql.java:199) ~[?:?]
at com.meteor.MailManager.MailCommand.onCommand(MailCommand.java:30) ~[?:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[PluginCommand.class:git-CatServer-1.12.2-5a600445]
... 15 more
这是什么问题？

为什么会这样，输入artmail时就会这样打不开邮箱An internal error occurred while attempting to perform this command

qq消息可以回复一下么

[16:55:04][Server thread/INFO]: Yyanga issued server command: /artmail[16:55:04] [Server thread/ERROR]: nuli
org.buki t. comand. CommandException: UlntandLed exception executing comand 'artmail' in plugin ArtMarlBox v1.0-SAPSHOT
at org.bukki t. command.PluginCommand.execute(P1uginComand. java :46)~[P1uginDomand class : i t-Catserverksync-1.12.2-be2981]
at org. bukki t. command. SimpleCommandlMlap.dispatch (simpleCommandMlap. javac:146)[SimpleComardlrp.clas:git-arserver.synp-1.12.2-be22981]
at org. bukkit.craftbukkit.vl_12_R1.CraftServer.dispatchCommand(raftserver. java:7O09)Tcraftserver:.clas.sit+iat.eren
sync-1.12.2-be22981]
at net.minecraft. network.Ne tHandLerPlayServer. func_14736l_d (NetHandlerPlayServer.java :1594)[pa.class:?]at net.minecraft.network. Me tHandlerPlayServer.func_147354_a(NMetHandlerPlayServer.java:1439) [pa. class:?]at net.minecraft. network. play.client. CPacke tCha tMessage.func_148833_a(SourceFile:37)[la. class:?
at net.minecraft. network.play.client.CPacketCha tMessage. func_148833_a(SourceFile:9) [1a. class:?]at net.minecraft.network.PacketThreadUti1$1.run(SourceFile:13)[hv$1.class:?]
at java.uti1.concurrent.Executors$RunnableAdapter.call (Unknown Source)[P:1.8.0_311]at java.util.concurrent.FutureTask.run (Unknown Source) [?:1.8.0_311]
at net.minecraft.util.Util.func_181617_a(Util.java:50) [h.class:?]
at net.minecraft. server.MinecraftServer. func_7i190_q(MinecraftServer.java.:843) MinecraftServer.class:?]at net.minecraft. server. dedicated. DedicatedServer.func_71190_q(DedicatedServer.java:473)[nz.class : ?]at net.minecraft.server.MfinecraftServer.func_71217_p(MinecraftServer.java:780)OlMinecraftServer.class :?]at met.minecraft. server.MinecraftServer.run(Minecraf tServer.java:634)[MinecraftServer.class:?]
at java.lang. Thread.run(Unknown Source)[?:1.8.0_311]
Caused by : java. lang.NullPointerException
at MySq1. MySql.getMailList(MySqi. java:116) ~[?:?]at Mysql.Mysql.loadMail(MySqi.java: 199)~[?:?]
at com.meteor.MailManager.MailCommand. onCommand(MailCommand.java:30)_~[?:?]
at org.bukki t.comand.P1luginComand.execute(P1uginComand.java:.44)~T[FP1uginCommand. class:git-latserverAsync-1.12.2-be22
981]
l
... 15 more

SPMailBox 和这个版本的区别是什么

LZ为什么我输入关于这个插件的指令时显示:An internal error occurred while attempting to perform this command 我是服主，有前置