EDIT:
(Schreibe ich hier wegen zu wenig zeichen)
Ich hab jetzt in der Konsole eine Fehlermeldung bekommen:
[16:25:58] [Server thread/WARN] [IC2.Uu]: Calculation failed.
java.util.concurrent.ExecutionException: java.lang.StackOverflowError
at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_101]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_101]
at ic2.core.uu.UuGraph.finishCalculation(UuGraph.java:219) [UuGraph.class:?]
at ic2.core.uu.UuGraph.find(UuGraph.java:94) [UuGraph.class:?]
at ic2.core.block.invslot.InvSlotScannable.isValidStack(InvSlotScannable.java:41) [InvSlotScannable.class:?]
at ic2.core.block.invslot.InvSlotScannable.access$000(InvSlotScannable.java:16) [InvSlotScannable.class:?]
at ic2.core.block.invslot.InvSlotScannable$ServerScannableCheck.executeRpc(InvSlotScannable.java:51) [InvSlotScannable$ServerScannableCheck.class:?]
at ic2.core.block.invslot.InvSlotScannable$ServerScannableCheck.executeRpc(InvSlotScannable.java:46) [InvSlotScannable$ServerScannableCheck.class:?]
at ic2.core.network.RpcHandler.processRpcRequest(RpcHandler.java:77) [RpcHandler.class:?]
at ic2.core.network.NetworkManager.onPacketData(NetworkManager.java:584) [NetworkManager.class:?]
at ic2.core.network.NetworkManager.onPacket(NetworkManager.java:540) [NetworkManager.class:?]
at cpw.mods.fml.common.eventhandler.ASMEventHandler_0_NetworkManager_onPacket_ServerCustomPacketEvent.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:140) [EventBus.class:?]
at cpw.mods.fml.common.network.FMLEventChannel.fireRead(FMLEventChannel.java:103) [FMLEventChannel.class:?]
at cpw.mods.fml.common.network.NetworkEventFiringHandler.channelRead0(NetworkEventFiringHandler.java:30) [NetworkEventFiringHandler.class:?]
at cpw.mods.fml.common.network.NetworkEventFiringHandler.channelRead0(NetworkEventFiringHandler.java:18) [NetworkEventFiringHandler.class:?]
at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:98) [SimpleChannelInboundHandler.class:?]
at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) [DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) [DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:785) [DefaultChannelPipeline.class:?]
at io.netty.channel.embedded.EmbeddedChannel.writeInbound(EmbeddedChannel.java:169) [EmbeddedChannel.class:?]
at cpw.mods.fml.common.network.internal.FMLProxyPacket.func_148833_a(FMLProxyPacket.java:77) [FMLProxyPacket.class:?]
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212) [ej.class:?]
at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:165) [nc.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:659) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:334) [lt.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547) [MinecraftServer.class:?]
at fastcraft.at.a(F:978) [fastcraft-1.23.jar:?]
at fastcraft.H.aq(F:36) [fastcraft-1.23.jar:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:396) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685) [li.class:?]
Caused by: java.lang.StackOverflowError
at java.util.HashMap.hash(HashMap.java:338) ~[?:1.8.0_101]
at java.util.HashMap.put(HashMap.java:611) ~[?:1.8.0_101]
at net.minecraft.nbt.NBTTagCompound.func_74782_a(NBTTagCompound.java:70) ~[dh.class:?]
at net.minecraft.nbt.NBTTagCompound.func_74737_b(NBTTagCompound.java:345) ~[dh.class:?]
at net.minecraft.nbt.NBTTagList.func_74737_b(NBTTagList.java:200) ~[dq.class:?]
at net.minecraft.nbt.NBTTagCompound.func_74737_b(NBTTagCompound.java:345) ~[dh.class:?]
at net.minecraft.item.ItemStack.func_77946_l(ItemStack.java:333) ~[add.class:?]
at ic2.core.util.StackUtil.copyWithSize(StackUtil.java:405) ~[StackUtil.class:?]
at ic2.core.uu.UuGraph.getInternal(UuGraph.java:160) ~[UuGraph.class:?]
at ic2.core.uu.UuGraph.getAll(UuGraph.java:185) ~[UuGraph.class:?]
at ic2.core.uu.UuGraph.access$200(UuGraph.java:26) ~[UuGraph.class:?]
at ic2.core.uu.UuGraph$Node.updateValue(UuGraph.java:270) ~[UuGraph$Node.class:?]
at ic2.core.uu.UuGraph$Node.setValue(UuGraph.java:253) ~[UuGraph$Node.class:?]
(Die Letzten 2 Zeilen dann 100 mal hintereinander)