alright, it looks like its working, thanks for your help!
*edit* as soon as i say that, the log says this:
[16:37:22] [Server thread/INFO] [FML]: [DifficultLife]Beginning saving of the file for world net.minecraft.world.WorldServer@2ee1edbc on side SERVER
[16:37:22] [Server thread/FATAL] [FML]: [DifficultLife] *Catched an exception during save of server file!
java.io.IOException: File does not exists! This means, that it got deleted after being created! Make sure, that your antivirus does not recognizes the file as a virus!
at difficultLife.utils.DLSaveStorage.saveServerWorldFile(DLSaveStorage.java:291) [DLSaveStorage.class:?]
at difficultLife.events.DLEventHandler.onWorldSaveEvent(DLEventHandler.java:360) [DLEventHandler.class:?]
at cpw.mods.fml.common.eventhandler.ASMEventHandler_115_DLEventHandler_onWorldSaveEvent_Save.invoke(.dynamic) [?:?]
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54) [ASMEventHandler.class:?]
at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:138) [EventBus.class:?]
at net.minecraft.world.WorldServer.func_73044_a(WorldServer.java:810) [mt.class:?]
at net.minecraft.server.MinecraftServer.func_71267_a(MinecraftServer.java:318) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:569) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685) [li.class:?]
i pasted it here because i can't post links yet, but any help for this?