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So basically my friends and I have been throwing together mods in a mod-pack so we can get something for everyone in the group to enjoy, for me it was working fine until I had tried to install ICBM Classic. We double checked everything so it shouldn't be an issue with versions, so if someone could help me figure out what the issue is and how to fix it it would be much appreciated. The issue comes up when my game tries to post-initialize the rustic mod but I'm unsure what it is beyond that.

Edit: Also, incase this helps: the issue is only happening with my game, my friends are able to load just fine.

Time: 1/11/19 10:24 PM
[B#402] Description: There was a severe problem during mod loading that has caused the game to fail
[B#402]
[B#402] net.minecraftforge.fml.common.LoaderExceptionModCrash: Caught exception from Rustic (rustic)
[B#402] Caused by: java.lang.ClassCastException: icbm.classic.client.models.mobs.ModelSnowmanXmas cannot be cast to net.minecraft.client.model.ModelSnowMan
[B#402] at icbm.classic.client.render.entity.RenderSnowmanXmas.getMainModel(RenderSnowmanXmas.java:33)
[B#402] at icbm.classic.client.render.entity.RenderSnowmanXmas.func_177087_b(RenderSnowmanXmas.java:15)
[B#402] at rustic.core.ClientProxy.postInit(ClientProxy.java:77)
[B#402] at rustic.core.Rustic.postInit(Rustic.java:153)
[B#402] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[B#402] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
[B#402] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
[B#402] at java.lang.reflect.Method.invoke(Unknown Source)
[B#402] at net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:624)
[B#402] at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
[B#402] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
[B#402] at java.lang.reflect.Method.invoke(Unknown Source)
[B#402] at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91)
[B#402] at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150)
[B#402] at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76)
[B#402] at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399)
[B#402] at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71)
[B#402] at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116)
[B#402] at com.google.common.eventbus.EventBus.post(EventBus.java:217)
[B#402] at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:219)
[B#402] at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:197)
[B#402] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[B#402] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
[B#402] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
[B#402] at java.lang.reflect.Method.invoke(Unknown Source)
[B#402] at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91)
[B#402] at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150)
[B#402] at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76)
[B#402] at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399)
[B#402] at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71)
[B#402] at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116)
[B#402] at com.google.common.eventbus.EventBus.post(EventBus.java:217)
[B#402] at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:136)
[B#402] at net.minecraftforge.fml.common.Loader.initializeMods(Loader.java:749)
[B#402] at net.minecraftforge.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:336)
[B#402] at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:535)
[B#402] at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:378)
[B#402] at net.minecraft.client.main.Main.main(SourceFile:123)
[B#402] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[B#402] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
[B#402] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
[B#402] at java.lang.reflect.Method.invoke(Unknown Source)
[B#402] at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
[B#402] at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

I can see

net.minecraftforge.fml.common.LoaderExceptionModCrash: Caught exception from Rustic (rustic)
Caused by: java.lang.ClassCastException: icbm.classic.client.models.mobs.ModelSnowmanXmas cannot be cast to net.minecraft.client.model.ModelSnowMan

and since you said it was all working until you installed ICBM Classic - I would take a guess there's a conflict between these 2 mods although why your friends work OK but your's crashes I don't know.

Are you sure you BOTH have exactly the same mods/versiond installed (your crash log doesn't show all the mods you're trying to load btw)
~ maybe you have a slightly older version than them perhaps ??