[17:33:10] [main/ERROR] [FML]: Caught exception from toughasnails (java.lang.NoClassDefFoundError: toughasnails/particle/EntitySnowflakeFX)
[17:33:10] [main/INFO] [STDOUT]: [net.minecraft.init.Bootstrap:func_179870_a:553]: ---- Minecraft Crash Report ----

WARNING: coremods are present:
TANLoadingPlugin (ToughAsNails-1.x.x-4.0.0.null-universal.jar)
Contact their authors BEFORE contacting forge

// Sorry :(

Time: 1/27/18 5:33 PM
Description: There was a severe problem during mod loading that has caused the game to fail

net.minecraftforge.fml.common.LoaderExceptionModCrash: Caught exception from Tough As Nails (toughasnails)
Caused by: java.lang.NoClassDefFoundError: toughasnails/particle/EntitySnowflakeFX
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at net.minecraftforge.fml.common.ProxyInjector.inject(ProxyInjector.java:85)
at net.minecraftforge.fml.common.FMLModContainer.constructMod(FMLModContainer.java:583)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91)
at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150)
at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76)
at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399)
at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71)
at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116)
at com.google.common.eventbus.EventBus.post(EventBus.java:217)
at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:253)
at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:231)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91)
at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150)
at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76)
at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399)
at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71)
at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116)
at com.google.common.eventbus.EventBus.post(EventBus.java:217)
at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:148)
at net.minecraftforge.fml.common.Loader.loadMods(Loader.java:568)
at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:231)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:466)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:377)
at net.minecraft.client.main.Main.main(SourceFile:123)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.ClassNotFoundException: toughasnails.particle.EntitySnowflakeFX
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 40 more
Caused by: java.lang.NoClassDefFoundError: glitchcore/particle/GFParticle
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
... 42 more
Caused by: java.lang.ClassNotFoundException: glitchcore.particle.GFParticle
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:101)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 46 more

A detailed walkthrough of the error, its code path and all known details is as follows:

-- System Details --
Details:
Minecraft Version: 1.12.2
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_151, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 506358032 bytes (482 MB) / 804782080 bytes (767 MB) up to 5726797824 bytes (5461 MB)
JVM Flags: 2 total; -Xmx6144M -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP 9.42 Powered by Forge 14.23.1.2587 6 mods loaded, 6 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

| State | ID                | Version      | Source                                      | Signature                                |
|:----- |:----------------- |:------------ |:------------------------------------------- |:---------------------------------------- |
| UC    | minecraft         | 1.12.2       | minecraft.jar                               | None                                     |
| UC    | mcp               | 9.42         | minecraft.jar                               | None                                     |
| UC    | FML               | 8.0.99.99    | forge-1.12.2-14.23.1.2587.jar               | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| UC    | forge             | 14.23.1.2587 | forge-1.12.2-14.23.1.2587.jar               | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| UC    | mercurius_updater | 1.0          | MercuriusUpdater-1.12.2.jar                 | None                                     |
| UE    | toughasnails      | 4.0.0        | ToughAsNails-1.x.x-4.0.0.null-universal.jar | None                                     |

Loaded coremods (and transformers): 

TANLoadingPlugin (ToughAsNails-1.x.x-4.0.0.null-universal.jar)
toughasnails.asm.transformer.CropDecayTransformer
toughasnails.asm.transformer.EntityRendererTransformer
toughasnails.asm.transformer.WorldTransformer
GL info: ' Vendor: 'ATI Technologies Inc.' Version: '4.5.13506 Compatibility Profile Context 23.20.15007.1005' Renderer: 'AMD Radeon R9 200 Series'

You don't have GlitchCore installed.