[14:42:39] [Server thread/INFO]: Starting world scan, this will take about 13,1 minutes with a powerful cpu.
[14:42:39] [Server thread/INFO]: The server will not respond while the calculations are running.
[14:42:39] [Server thread/INFO]: An unknown error occurred while attempting to perform this command
[14:42:39] [Server thread/WARN]: Couldn't process command: 'ic2 uu-world-scan large'
java.lang.NoClassDefFoundError: net/minecraft/world/chunk/EmptyChunk
	at ic2.core.uu.DropScan$DummyWorld.func_72970_h(DropScan.java:379) ~[DropScan$DummyWorld.class:?]
	at net.minecraft.world.WorldServer.<init>(WorldServer.java:115) ~[ls.class:?]
	at ic2.core.uu.DropScan$DummyWorld.<init>(DropScan.java:368) ~[DropScan$DummyWorld.class:?]
	at ic2.core.uu.DropScan.<init>(DropScan.java:90) ~[DropScan.class:?]
	at ic2.core.command.CommandIc2.cmdUuWorldScan(CommandIc2.java:262) ~[CommandIc2.class:?]
	at ic2.core.command.CommandIc2.func_184881_a(CommandIc2.java:152) ~[CommandIc2.class:?]
	at net.minecraft.command.CommandHandler.func_175786_a(CommandHandler.java:104) [k.class:?]
	at net.minecraft.command.CommandHandler.func_71556_a(CommandHandler.java:83) [k.class:?]
	at net.minecraft.server.dedicated.DedicatedServer.func_71333_ah(DedicatedServer.java:423) [ld.class:?]
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:388) [ld.class:?]
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471) [MinecraftServer.class:?]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_112]
Caused by: java.lang.ClassNotFoundException: net.minecraft.world.chunk.EmptyChunk
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_112]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_112]
	... 13 more
Caused by: java.lang.NullPointerException
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182) ~[launchwrapper-1.12.jar:?]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_112]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_112]
	... 13 more