java.util.ConcurrentModificationException: This exception has no message.

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via GitHub by roastnewt
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This exception has no message.
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This exception has no message.
java.util.ConcurrentModificationException:
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)
at java.util.HashMap$EntryIterator.next(HashMap.java:1463)
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)

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