---THIS ERROR STARTS THE READ TIMED OUT MESSAGES
[SEVERE] java.util.ConcurrentModificationException [SEVERE] at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372) [SEVERE] at java.util.AbstractList$Itr.next(AbstractList.java:343) [SEVERE] at net.minecraft.server.EntityLiving.d(EntityLiving.java:1135) [SEVERE] at net.minecraft.server.EntityAgeable.d(EntityAgeable.java:36) [SEVERE] at net.minecraft.server.EntityAnimal.d(SourceFile:32) [SEVERE] at net.minecraft.server.EntityLiving.h_(EntityLiving.java:447) [SEVERE] at net.minecraft.server.World.entityJoinedWorld(World.java:1239) [SEVERE] at net.minecraft.server.WorldServer.entityJoinedWorld(WorldServer.java:498) [SEVERE] at net.minecraft.server.World.playerJoinedWorld(World.java:1221) [SEVERE] at net.minecraft.server.World.tickEntities(World.java:1119) [SEVERE] at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:565) [SEVERE] at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212) [SEVERE] at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:474) [SEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:406) [SEVERE] at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)

---THIS ERROR APPEARS AFTER THE ABOVE ERROR
Description: Exception in server tick loop
java.util.ConcurrentModificationException
    at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
    at java.util.AbstractList$Itr.next(AbstractList.java:343)
    at net.minecraft.server.World.getCubes(World.java:957)
    at net.minecraft.server.Entity.move(Entity.java:518)
    at net.minecraft.server.EntityLiving.e(EntityLiving.java:953)
    at net.minecraft.server.EntityLiving.d(EntityLiving.java:1124)
    at net.minecraft.server.EntityMonster.d(EntityMonster.java:21)
    at net.minecraft.server.EntitySkeleton.d(EntitySkeleton.java:64)
    at net.minecraft.server.EntityLiving.h_(EntityLiving.java:447)
    at net.minecraft.server.EntityMonster.h_(EntityMonster.java:25)
    at net.minecraft.server.World.entityJoinedWorld(World.java:1239)
    at net.minecraft.server.WorldServer.entityJoinedWorld(WorldServer.java:498)
    at net.minecraft.server.World.playerJoinedWorld(World.java:1221)
    at net.minecraft.server.World.tickEntities(World.java:1119)
    at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:565)
    at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
    at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:474)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:406)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)