java.util.concurrent.ExecutionException: java.lang.NoClassDefFoundError: net/minecraft/client/model/ModelBiped
    at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_72]
    at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_72]
    at net.minecraft.util.Util.func_181617_a(SourceFile:47) [h.class:?]
    at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:723) [MinecraftServer.class:?]
    at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:396) [nz.class:?]
    at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668) [MinecraftServer.class:?]
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526) [MinecraftServer.class:?]
    at java.lang.Thread.run(Thread.java:745) [?:1.8.0_72]
Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/model/ModelBiped
    at com.vicmatskiv.weaponlib.EntityShellCasing.setPositionAndDirection(EntityShellCasing.java:78) ~[EntityShellCasing.class:?]
    at com.vicmatskiv.weaponlib.Weapon$Builder.lambda$build$37(Weapon.java:652) ~[Weapon$Builder.class:?]
    at com.vicmatskiv.weaponlib.WeaponFireAspect.serverFire(WeaponFireAspect.java:317) ~[WeaponFireAspect.class:?]
    at com.vicmatskiv.weaponlib.WeaponFireAspect.serverFire(WeaponFireAspect.java:286) ~[WeaponFireAspect.class:?]
    at com.vicmatskiv.weaponlib.TryFireMessageHandler.lambda$onCompatibleMessage$359(TryFireMessageHandler.java:28) ~[TryFireMessageHandler.class:?]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_72]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_72]
    at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]
    ... 5 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.model.ModelBiped
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_72]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_72]
    at com.vicmatskiv.weaponlib.EntityShellCasing.setPositionAndDirection(EntityShellCasing.java:78) ~[EntityShellCasing.class:?]
    at com.vicmatskiv.weaponlib.Weapon$Builder.lambda$build$37(Weapon.java:652) ~[Weapon$Builder.class:?]
    at com.vicmatskiv.weaponlib.WeaponFireAspect.serverFire(WeaponFireAspect.java:317) ~[WeaponFireAspect.class:?]
    at com.vicmatskiv.weaponlib.WeaponFireAspect.serverFire(WeaponFireAspect.java:286) ~[WeaponFireAspect.class:?]
    at com.vicmatskiv.weaponlib.TryFireMessageHandler.lambda$onCompatibleMessage$359(TryFireMessageHandler.java:28) ~[TryFireMessageHandler.class:?]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_72]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_72]
    at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]
    ... 5 more
Caused by: net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerException: Exception in class transformer com.vicmatskiv.weaponlib.core.WeaponlibClassTransformer@1bf18c7e from coremod weaponlib
    at net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerWrapper.transform(ASMTransformerWrapper.java:262) ~[forge-1.12.2-14.23.4.2705-universal.jar:?]
    at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279) ~[launchwrapper-1.12.jar:?]
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176) ~[launchwrapper-1.12.jar:?]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_72]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_72]
    at com.vicmatskiv.weaponlib.EntityShellCasing.setPositionAndDirection(EntityShellCasing.java:78) ~[EntityShellCasing.class:?]
    at com.vicmatskiv.weaponlib.Weapon$Builder.lambda$build$37(Weapon.java:652) ~[Weapon$Builder.class:?]
    at com.vicmatskiv.weaponlib.WeaponFireAspect.serverFire(WeaponFireAspect.java:317) ~[WeaponFireAspect.class:?]
    at com.vicmatskiv.weaponlib.WeaponFireAspect.serverFire(WeaponFireAspect.java:286) ~[WeaponFireAspect.class:?]
    at com.vicmatskiv.weaponlib.TryFireMessageHandler.lambda$onCompatibleMessage$359(TryFireMessageHandler.java:28) ~[TryFireMessageHandler.class:?]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_72]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_72]
    at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]
    ... 5 more
Caused by: java.lang.NullPointerException
    at org.objectweb.asm.ClassReader.<init>(Unknown Source) ~[asm-all-5.2.jar:5.2]
    at com.vicmatskiv.weaponlib.core.WeaponlibClassTransformer.transform(WeaponlibClassTransformer.java:123) ~[mw-1.11.7.7_mc1.12.2.jar:?]
    at net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerWrapper.transform(ASMTransformerWrapper.java:258) ~[forge-1.12.2-14.23.4.2705-universal.jar:?]
    at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279) ~[launchwrapper-1.12.jar:?]
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176) ~[launchwrapper-1.12.jar:?]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_72]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_72]
    at com.vicmatskiv.weaponlib.EntityShellCasing.setPositionAndDirection(EntityShellCasing.java:78) ~[EntityShellCasing.class:?]
    at com.vicmatskiv.weaponlib.Weapon$Builder.lambda$build$37(Weapon.java:652) ~[Weapon$Builder.class:?]
    at com.vicmatskiv.weaponlib.WeaponFireAspect.serverFire(WeaponFireAspect.java:317) ~[WeaponFireAspect.class:?]
    at com.vicmatskiv.weaponlib.WeaponFireAspect.serverFire(WeaponFireAspect.java:286) ~[WeaponFireAspect.class:?]
    at com.vicmatskiv.weaponlib.TryFireMessageHandler.lambda$onCompatibleMessage$359(TryFireMessageHandler.java:28) ~[TryFireMessageHandler.class:?]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_72]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_72]
    at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]
    ... 5 more