java.lang.NoClassDefFoundError: ain
at baritone.api.Settings.(Unknown Source)
at baritone.api.BaritoneAPI.(Unknown Source)
at me.halqq.aurora.client.impl.modules.combat.killaura.KillRoinc.onUpdate(KillRoinc.java:116)
at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1382)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
at me.halqq.aurora.client.api.module.ModuleManager.onTick(ModuleManager.java:116)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_15_ModuleManager_onTick_ClientTickEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182)
at net.minecraftforge.fml.common.FMLCommonHandler.onPostClientTick(FMLCommonHandler.java:349)
at net.minecraft.client.Minecraft.runTick(Minecraft.java:2037)
at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1187)
at net.minecraft.client.Minecraft.run(Minecraft.java:441)
at net.minecraft.client.main.Main.main(Main.java:118)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97)
at GradleStart.main(GradleStart.java:25)

someone help me

Duplicate #3855

but my forge gradle dont have fg.deobf

#3855 (comment), also update to forgegradle 3+ then you get fg.deobf, but it doesn't help because we're notch mapped instead of searge mapped in 1.12.2, currently. hence having to use that one leijurv put up. also do make sure your mcp mappings exactly match those used in baritone