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Every time I try to launch forge with optifine I get a crash.

Here's the crash report:

---- Minecraft Crash Report -------- Minecraft Crash Report ----
WARNING: coremods are present:Contact their authors BEFORE contacting forge
// You're mean.
Time: 6/28/17 11:49 AMDescription: Initializing game
java.lang.AbstractMethodError at net.minecraftforge.client.model.MultiModelState.apply(MultiModelState.java:67) at net.minecraftforge.client.model.MultiModelState.getPartState(MultiModelState.java:50) at net.minecraftforge.client.model.ModelLoader$WeightedRandomModel.bake(ModelLoader.java:779) at net.minecraftforge.client.model.ModelLoader$MultipartModel.bake(ModelLoader.java:1255) at net.minecraftforge.client.model.ModelLoader.func_177570_a(ModelLoader.java:186) at net.minecraft.client.renderer.block.model.ModelManager.func_110549_a(ModelManager.java:28) at net.minecraft.client.resources.SimpleReloadableResourceManager.func_110542_a(SimpleReloadableResourceManager.java:121) at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:512) 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(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:483) at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

A detailed walkthrough of the error, its code path and all known details is as follows:---------------------------------------------------------------------------------------
-- Head --Thread: Client threadStacktrace: at net.minecraftforge.client.model.MultiModelState.apply(MultiModelState.java:67) at net.minecraftforge.client.model.MultiModelState.getPartState(MultiModelState.java:50) at net.minecraftforge.client.model.ModelLoader$WeightedRandomModel.bake(ModelLoader.java:779) at net.minecraftforge.client.model.ModelLoader$MultipartModel.bake(ModelLoader.java:1255) at net.minecraftforge.client.model.ModelLoader.func_177570_a(ModelLoader.java:186) at net.minecraft.client.renderer.block.model.ModelManager.func_110549_a(ModelManager.java:28) at net.minecraft.client.resources.SimpleReloadableResourceManager.func_110542_a(SimpleReloadableResourceManager.java:121) at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:512)
-- Initialization --Details:Stacktrace: 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(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:483) at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
-- System Details --Details: Minecraft Version: 1.12 Operating System: Windows 10 (amd64) version 10.0 Java Version: 1.8.0_25, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 165224240 bytes (157 MB) / 346390528 bytes (330 MB) up to 1060372480 bytes (1011 MB) JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0 FML: MCP 9.40 Powered by Forge 14.21.0.2382 Optifine OptiFine_1.12_HD_U_C3 4 mods loaded, 4 mods active States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored UCH minecraft{1.12} [Minecraft] (minecraft.jar) UCH mcp{9.19} [Minecraft Coder Pack] (minecraft.jar) UCH FML{8.0.99.99} [Forge Mod Loader] (forge-1.12-14.21.0.2382.jar) UCH forge{14.21.0.2382} [Minecraft Forge] (forge-1.12-14.21.0.2382.jar) Loaded coremods (and transformers): GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.5.0 NVIDIA 382.33' Renderer: 'GeForce GTX 1070/PCIe/SSE2' Launched Version: 1.12-forge1.12-14.21.0.2382 LWJGL: 2.9.4 OpenGL: GeForce GTX 1070/PCIe/SSE2 GL version 4.5.0 NVIDIA 382.33, NVIDIA Corporation GL Caps: Using GL 1.3 multitexturing.Using GL 1.3 texture combiners.Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.Shaders are available because OpenGL 2.1 is supported.VBOs are available because OpenGL 1.5 is supported.
Using VBOs: Yes Is Modded: Definitely; Client brand changed to 'fml,forge' Type: Client (map_client.txt) Resource Packs: DefinitivePainterly-1p10.zip (incompatible), Painterly Continuation Patch.zip, [256x] EPIC HORIZON.zip Current Language: English (US) Profiler Position: N/A (disabled) CPU: 8x Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz OptiFine Version: OptiFine_1.12_HD_U_C3 Render Distance Chunks: 16 Mipmaps: 4 Anisotropic Filtering: 1 Antialiasing: 0 Multitexture: false Shaders: Sildurs basic shaders v1.051 DoF.zip OpenGlVersion: 4.5.0 NVIDIA 382.33 OpenGlRenderer: GeForce GTX 1070/PCIe/SSE2 OpenGlVendor: NVIDIA Corporation CpuCount: 8

Same problem.

Optifine versions 1.12_HD_U_C2, C3 both have the same issue.

The most recent version of forge that is supported by optifine is build 1.12-14.21.0.2362. Any version after that does not work.

I looked at the forge changelog and I think this is the reason why optifine stopped working:

Hope I helped.

edit: OptiFine 1.12_HD_U_C4_pre works with latest version of forge but it is a preview that still has bugs at the moment.