[20:14:18] [Server thread/ERROR]: Encountered an unexpected exception

net.minecraft.util.ReportedException: Exception ticking world
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:945) ~[MinecraftServer.class:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:458) ~[lt.class:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:806) ~[MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:665) [MinecraftServer.class:?]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_202]
Caused by: java.util.ConcurrentModificationException
        at java.util.ArrayList$Itr.checkForComodification(Unknown Source) ~[?:1.8.0_202]
        at java.util.ArrayList$Itr.next(Unknown Source) ~[?:1.8.0_202]
        at org.bukkit.craftbukkit.v1_7_R4.CraftWorld.processChunkGC(CraftWorld.java:1449) ~[CraftWorld.class:1.7.10-R0.1-SNAPSHOT]
        at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:316) ~[mt.class:?]
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:928) ~[MinecraftServer.class:?]
        ... 4 more
[20:14:18] [Server thread/ERROR]:         Cause of unexpected exception was
java.util.ConcurrentModificationException
        at java.util.ArrayList$Itr.checkForComodification(Unknown Source) ~[?:1.8.0_202]
        at java.util.ArrayList$Itr.next(Unknown Source) ~[?:1.8.0_202]
        at org.bukkit.craftbukkit.v1_7_R4.CraftWorld.processChunkGC(CraftWorld.java:1449) ~[CraftWorld.class:1.7.10-R0.1-SNAPSHOT]
        at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:316) ~[mt.class:?]
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:928) ~[MinecraftServer.class:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:458) ~[lt.class:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:806) ~[MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:665) [MinecraftServer.class:?]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_202]
每隔几小时崩一次有人知道为什么吗？

区块gc.. 参数多了还是插件...