求解一个错误报告
Description: Exception in server tick loopjava.util.ConcurrentModificationExceptionat java.util.HashMap$HashIterator.nextNode(Unknown Source)at java.util.HashMap$KeyIterator.next(Unknown Source)at net.minecraft.entity.EntityTracker.func_72788_a(EntityTracker.java:299)at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:721)at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613)at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:240)at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)at java.lang.Thread.run(Unknown Source)
Description: Exception in server tick loopjava.util.ConcurrentModificationExceptionat java.util.HashMap$HashIterator.nextNode(Unknown Source)at java.util.HashMap$KeyIterator.next(Unknown Source)at net.minecraft.entity.EntityTracker.func_72788_a(EntityTracker.java:299)at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:721)at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613)at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:240)at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)at java.lang.Thread.run(Unknown Source)
