a.rb

java.lang.NullPointerException
        at net.minecraft.world.World.func_180495_p(World.java:828) ~[aht.class:?]
        at com.rwtema.extrautils2.blocks.BlockPassiveGenerator$GeneratorTypes$3.getPowerLevel(BlockPassiveGenerator.java:204) ~[BlockPassiveGenerator$GeneratorTypes$3.c$
        at com.rwtema.extrautils2.tile.TilePassiveGenerator.getPower(TilePassiveGenerator.java:15) ~[TilePassiveGenerator.class:?]
        at com.rwtema.extrautils2.power.PowerManager$PowerFreq.refresh(PowerManager.java:383) ~[PowerManager$PowerFreq.class:?]
        at com.rwtema.extrautils2.power.PowerManager.tick(PowerManager.java:350) ~[PowerManager.class:?]
        at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_211_PowerManager_tick_ServerTickEvent.invoke(.dynamic) ~[?:?]
        at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:49) ~[ASMEventHandler.class:?]
        at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:140) ~[EventBus.class:?]
        at net.minecraftforge.fml.common.FMLCommonHandler.onPostServerTick(FMLCommonHandler.java:253) ~[FMLCommonHandler.class:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:653) ~[MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:467) [MinecraftServer.class:?]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_74]