下面是服务端内报错
[11:10:06] [Craft Scheduler Thread - 1268/WARN]: java.lang.IllegalAccessException: Class com.a
pletec.board.j.c can not access a member of class net.minecraft.network.play.server.SPacketPla
erListHeaderFooter with modifiers "private"
[11:10:06] [Craft Scheduler Thread - 1268/WARN]:        at sun.reflect.Reflection.ensureMember
ccess(Unknown Source)
[11:10:06] [Craft Scheduler Thread - 1268/WARN]:        at java.lang.reflect.AccessibleObject.
lowCheckMemberAccess(Unknown Source)
[11:10:06] [Craft Scheduler Thread - 1268/WARN]:        at java.lang.reflect.AccessibleObject.
heckAccess(Unknown Source)
[11:10:06] [Craft Scheduler Thread - 1268/WARN]:        at java.lang.reflect.Field.set(Unknown
Source)
[11:10:06] [Craft Scheduler Thread - 1268/WARN]:        at com.appletec.board.j.c.a(Reflect_1_
2_R1.java:52)
[11:10:06] [Craft Scheduler Thread - 1268/WARN]:        at com.appletec.board.g.a.g.update(Tab
istLineContainer.java:51)
[11:10:06] [Craft Scheduler Thread - 1268/WARN]:        at com.appletec.board.k.h.run(TablistP
ayerUpdateTask.java:26)
[11:10:06] [Craft Scheduler Thread - 1268/WARN]:        at org.bukkit.craftbukkit.v1_12_R1.sch
duler.CraftTask.run(CraftTask.java:76)
[11:10:06] [Craft Scheduler Thread - 1268/WARN]:        at org.bukkit.craftbukkit.v1_12_R1.sch
duler.CraftAsyncTask.run(CraftAsyncTask.java:52)
[11:10:06] [Craft Scheduler Thread - 1268/WARN]:        at java.util.concurrent.ThreadPoolExec
tor.runWorker(Unknown Source)
[11:10:06] [Craft Scheduler Thread - 1268/WARN]:        at java.util.concurrent.ThreadPoolExec
tor$Worker.run(Unknown Source)
[11:10:06] [Craft Scheduler Thread - 1268/WARN]:        at java.lang.Thread.run(Unknown Source
[11:10:06] [Server thread/INFO]: Laotou lost connection: Internal Exception: java.io.IOExcepti
n: 你的主机中的软件中止了一个已建立的连接。

这样之后客户端直接掉线
求崩溃原因和如何解决
版本1.12.2

已自行解决