Check these Severe on Reload, WOW

1:57 AM [SEVERE] java.util.ConcurrentModificationException
11:57 AM [SEVERE] at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
11:57 AM [SEVERE] at java.util.HashMap$KeyIterator.next(Unknown Source)
11:57 AM [SEVERE] at net.minecraft.server.World.a(World.java:2351)
11:57 AM [SEVERE] at net.minecraft.server.ChunkLoader.a(SourceFile:140)
11:57 AM [SEVERE] at net.minecraft.server.ChunkRegionLoader.a(SourceFile:84)
11:57 AM [SEVERE] at net.minecraft.server.ChunkProviderServer.saveChunk(ChunkProviderServer.java:163)
11:57 AM [SEVERE] at net.minecraft.server.ChunkProviderServer.unloadChunks(ChunkProviderServer.java:247)
11:57 AM [SEVERE] at net.minecraft.server.World.doTick(World.java:1728)
11:57 AM [SEVERE] at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:523)
11:57 AM [SEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:434)
11:57 AM [SEVERE] at net.minecraft.server.ThreadServerApplication.run(SourceFile:465)
11:57 AM [SEVERE] java.util.ConcurrentModificationException
11:57 AM [SEVERE] at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
11:57 AM [SEVERE] at java.util.HashMap$KeyIterator.next(Unknown Source)
11:57 AM [SEVERE] at net.minecraft.server.World.a(World.java:2351)
11:57 AM [SEVERE] at net.minecraft.server.ChunkLoader.a(SourceFile:140)
11:57 AM [SEVERE] at net.minecraft.server.ChunkRegionLoader.a(SourceFile:84)
11:57 AM [SEVERE] at net.minecraft.server.ChunkProviderServer.saveChunk(ChunkProviderServer.java:163)
11:57 AM [SEVERE] at net.minecraft.server.ChunkProviderServer.unloadChunks(ChunkProviderServer.java:247)
11:57 AM [SEVERE] at net.minecraft.server.World.doTick(World.java:1728)
11:57 AM [SEVERE] at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:523)
11:57 AM [SEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:434)
11:57 AM [SEVERE] at net.minecraft.server.ThreadServerApplication.run(SourceFile:465)
11:57 AM [SEVERE] java.util.ConcurrentModificationException
11:57 AM [SEVERE] at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
11:57 AM [SEVERE] at java.util.ArrayList$Itr.next(Unknown Source)
11:57 AM [SEVERE] at net.minecraft.server.ChunkProviderServer.c(ChunkProviderServer.java:64)
11:57 AM [SEVERE] at net.minecraft.server.PlayerManager.flush(PlayerManager.java:43)
11:57 AM [SEVERE] at net.minecraft.server.ServerConfigurationManager.tick(ServerConfigurationManager.java:366)
11:57 AM [SEVERE] at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:537)
11:57 AM [SEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:434)
11:57 AM [SEVERE] at net.minecraft.server.ThreadServerApplication.run(SourceFile:465)
11:57 AM [SEVERE] Unexpected exception

Caused by MULTIVERSE and SERVERSIGNS

Fix for multiverse for now,

Go into your multiverse core, world configureation file,
Find auto load worldnether, set that function to FALSE and the reload should work OK

As for Serversigns,

I found some errors in the permissions commands that are set by defult in the config, make sure those are correct, also I changed to allow for console commands value to True and I do not seem to get anymore Severe errors on server reloads.

EDIT by Moderator: merged posts, please use the edit button instead of double posting.