I was wondering if anyone could help me fix my multiverse-core since it doesnt want to work for me. Every time I try to make a world it says: "An internal error occured while attempting to perform this command. Details were printed to to server console and logs, please add that to your bug report." So here is the text the console showed me: (start from bottom)

15.08 20:43:46 [Server] INFO at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(SourceFile:9) [craftbukkit-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Bukkit-880a532]
15.08 20:43:46 [Server] INFO at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(SourceFile:37) [craftbukkit-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Bukkit-880a532]
15.08 20:43:46 [Server] INFO at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:966) [craftbukkit-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Bukkit-880a532]
15.08 20:43:46 [Server] INFO at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1106) [craftbukkit-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Bukkit-880a532]
15.08 20:43:46 [Server] INFO at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:620) [craftbukkit-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Bukkit-880a532]
15.08 20:43:46 [Server] INFO at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:140) [craftbukkit-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Bukkit-880a532]
15.08 20:43:46 [Server] INFO at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) [craftbukkit-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Bukkit-880a532]
15.08 20:43:46 [Server] INFO at com.onarandombox.MultiverseCore.MultiverseCore.onCommand(MultiverseCore.java:897) [Multiverse-Core.jar:?]
15.08 20:43:46 [Server] INFO at com.pneumaticraft.commandhandler.multiverse.CommandHandler.locateAndRunCommand(CommandHandler.java:93) [Multiverse-Core.jar:?]
15.08 20:43:46 [Server] INFO at com.pneumaticraft.commandhandler.multiverse.CommandHandler.processFoundCommands(CommandHandler.java:143) [Multiverse-Core.jar:?]
15.08 20:43:46 [Server] INFO at com.pneumaticraft.commandhandler.multiverse.CommandHandler.checkAndRunCommand(CommandHandler.java:279) [Multiverse-Core.jar:?]
15.08 20:43:46 [Server] INFO at com.onarandombox.MultiverseCore.commands.CreateCommand.runCommand(CreateCommand.java:114) [Multiverse-Core.jar:?]
15.08 20:43:46 [Server] INFO at com.onarandombox.MultiverseCore.utils.WorldManager.addWorld(WorldManager.java:229) [Multiverse-Core.jar:?]
15.08 20:43:46 [Server] INFO at com.onarandombox.MultiverseCore.utils.WorldManager.doLoad(WorldManager.java:421) [Multiverse-Core.jar:?]
15.08 20:43:46 [Server] INFO at org.bukkit.WorldCreator.createWorld(WorldCreator.java:261) [craftbukkit-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Bukkit-880a532]
15.08 20:43:46 [Server] INFO at org.bukkit.Bukkit.createWorld(Bukkit.java:473) [craftbukkit-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Bukkit-880a532]
15.08 20:43:46 [Server] INFO at org.bukkit.craftbukkit.v1_8_R3.CraftServer.createWorld(CraftServer.java:912) [craftbukkit-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Bukkit-880a532]
15.08 20:43:46 [Server] INFO at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:486) [craftbukkit-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Bukkit-880a532]
15.08 20:43:46 [Server] INFO at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:501) [craftbukkit-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Bukkit-880a532]
15.08 20:43:46 [Server] INFO at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[craftbukkit-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Bukkit-880a532]
15.08 20:43:46 [Server] INFO at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[craftbukkit-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Bukkit-880a532]
15.08 20:43:46 [Server] INFO org.bukkit.event.EventException
15.08 20:43:46 [Server] ERROR Could not pass event WorldLoadEvent to Multiverse-Core v2.5-b691
15.08 20:43:46 [Server] INFO Preparing start region for level 6 (Seed: -3445705454741394945)
15.08 20:43:46 [Server] INFO GroupManager - INFO - Don't forget to configure/mirror this world in config.yml.
15.08 20:43:46 [Server] INFO GroupManager - INFO - Creating data for: Test3
15.08 20:43:46 [Server] INFO GroupManager - INFO - New world detected...
15.08 20:43:46 [Server] INFO Loading World & Settings - 'Test3' - Env: NORMAL - Type: FLAT

So I curiously tried to tp to my "failed world" and this is what came up : "Multiverse does not know how to take you to Test". It also said that when i tried to tp to the world i was in (Default). The plugin shows up in my plugins list green with my other plugins and also tells me the commands in it when i type /mv but non of them work. In the files everything looks normal and nothing seems to be missing so I am really confused what is wrong.

Here is my plugins list: Installer, TimTheEnchanter, Adminfun, Essentials, EssentialsGeoIp, EssentialsChat, GroupManager, ClearLag, EssentialsAntiBuild, mcMMO, EssentialsSpawn, EssentialsXMPP, EssentialsProtect, Multiverse-Core, WarpPortals, WorldEdit.

I am using the latest versions of all essentials plugins including groupmanager and I am also using worldedit 6. I appreciate if you could help me since I cannot create more than 1 world :/
If you need more information please tell me.