Describe the bug
Hi MrCrayFish,
I'm reporting a crash with your mod in my custom pack.

Crash report
---- Minecraft Crash Report ----

WARNING: coremods are present:
FarseekCoreMod (Farseek-1.12-2.3.1.jar)
MicdoodlePlugin (MicdoodleCore-1.12.2-4.0.1.181.jar)
ForgelinPlugin (Forgelin-1.7.4.jar)
Plugin (NotEnoughIDs-1.5.4.3.jar)
LibrarianLib Plugin (librarianlib-1.12.2-4.15.jar)
HCASM (HammerCore-1.12.2-2.0.3.1.jar)
LoadingPlugin (Bloodmoon-MC1.12.2-1.5.3.jar)
MalisisCorePlugin (malisiscore-1.12.2-6.4.0.jar)
Inventory Tweaks Coremod (InventoryTweaks-1.63.jar)
IELoadingPlugin (ImmersiveEngineering-core-0.12-86.jar)
AppleCore (AppleCore-mc1.12.2-3.1.4.jar)
LoadingPlugin (Quark-r1.5-130.jar)
Do not report to Forge! (If you haven't disabled the FoamFix coremod, try disabling it in the config! Note that this bit of text will still appear.) (foamfix-0.10.2-1.12.2.jar)
TransformerLoader (OpenComputers-MC1.12.2-1.7.2.67.jar)
OpenModsCorePlugin (OpenModsLib-1.12.2-0.12.1.jar)
CTMCorePlugin (CTM-MC1.12.2-0.3.2.20.jar)
Contact their authors BEFORE contacting forge

// I bet Cylons wouldn't have this problem.

Time: 10/28/18 5:04 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 MrCrayfish's Furniture Mod (cfm)
Caused by: java.lang.NoClassDefFoundError: Could not initialize class com.mrcrayfish.furniture.render.tileentity.MirrorRenderer
at com.mrcrayfish.furniture.proxy.ClientProxy.init(ClientProxy.java:54)
at com.mrcrayfish.furniture.MrCrayfishFurnitureMod.init(MrCrayfishFurnitureMod.java:92)
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.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:624)
at sun.reflect.GeneratedMethodAccessor4.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$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116)
at com.google.common.eventbus.EventBus.post(EventBus.java:217)
at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:218)
at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:196)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91)
at com.google.common.eventbus.Subscriber$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:135)
at net.minecraftforge.fml.common.Loader.initializeMods(Loader.java:744)
at net.minecraftforge.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:336)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:534)
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)

Please complete the following information:

• Minecraft Version: 1.12.2
• Mod Version: furniture-5.15.0-1.12.2

Most likely one of the core mods you have installed, not my Furniture Mod.