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java.util.ConcurrentModificationException: 	at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)	at java.util.HashMap$EntryIterator.next(HashMap.java:1463)	at java.util.HashMap$EntryIterator.next(HashMap.java:1461)	at me.main__.util.multiverse.SerializationConfig.SerializationConfig.flushPendingVPropChanges(SerializationConfig.java:245)	at com.onarandombox.MultiverseCore.WorldProperties.flushChanges(WorldProperties.java:374)	at com.onarandombox.MultiverseCore.MVWorld.(MVWorld.java:89)	at com.onarandombox.MultiverseCore.MVWorld.(MVWorld.java:56)	at com.onarandombox.MultiverseCore.utils.WorldManager.doLoad(WorldManager.java:427)	at com.onarandombox.MultiverseCore.utils.WorldManager.doLoad(WorldManager.java:402)	at com.onarandombox.MultiverseCore.utils.WorldManager.doLoad(WorldManager.java:377)	at com.onarandombox.MultiverseCore.utils.WorldManager.loadWorlds(WorldManager.java:676)	at com.onarandombox.MultiverseCore.MultiverseCore.onEnable(MultiverseCore.java:306)	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321)	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:340)	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405)	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugin(CraftServer.java:357)	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.enablePlugins(CraftServer.java:317)	at net.minecraft.server.v1_8_R3.MinecraftServer.s(MinecraftServer.java:408)	at net.minecraft.server.v1_8_R3.MinecraftServer.k(MinecraftServer.java:372)	at net.minecraft.server.v1_8_R3.MinecraftServer.a(MinecraftServer.java:327)	at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:267)	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:560)	at java.lang.Thread.run(Thread.java:745)