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I keep receiving crashes trying to run Optifine with forge 1.8.8.

Forge version

http://files.minecraftforge.net/maven/net/minecraftforge/forge/index_1.8.8.html

Optifine version

http://optifine.net/adloadx?f=OptiFine_1.8.8_HD_U_G7.jar

---- Minecraft Crash Report ----

WARNING: coremods are present:
Contact their authors BEFORE contacting forge

// Surprise! Haha. Well, this is awkward.

Time: 12/27/15 12:57 PM
Description: Initializing game

java.lang.AbstractMethodError: net.minecraft.client.resources.model.ModelRotation.apply(Lcom/google/common/base/Optional;)Lcom/google/common/base/Optional;
	at net.minecraftforge.client.model.IPerspectiveAwareModel$MapWrapper.getTransforms(IPerspectiveAwareModel.java:52)
	at net.minecraftforge.client.model.ModelLoader$VanillaModelWrapper.bake(ModelLoader.java:365)
	at net.minecraftforge.client.model.ModelLoader.func_177570_a(ModelLoader.java:126)
	at net.minecraft.client.resources.model.ModelManager.func_110549_a(ModelManager.java:28)
	at net.minecraft.client.resources.SimpleReloadableResourceManager.func_110542_a(SimpleReloadableResourceManager.java:120)
	at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:478)
	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:329)
	at net.minecraft.client.main.Main.main(SourceFile:124)
	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 --
Stacktrace:
	at net.minecraftforge.client.model.IPerspectiveAwareModel$MapWrapper.getTransforms(IPerspectiveAwareModel.java:52)
	at net.minecraftforge.client.model.ModelLoader$VanillaModelWrapper.bake(ModelLoader.java:365)
	at net.minecraftforge.client.model.ModelLoader.func_177570_a(ModelLoader.java:126)
	at net.minecraft.client.resources.model.ModelManager.func_110549_a(ModelManager.java:28)
	at net.minecraft.client.resources.SimpleReloadableResourceManager.func_110542_a(SimpleReloadableResourceManager.java:120)
	at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:478)

-- Initialization --
Details:
Stacktrace:
	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:329)
	at net.minecraft.client.main.Main.main(SourceFile:124)
	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: 1.8.8
	Operating System: Windows 10 (amd64) version 10.0
	CPU: 8x Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz
	Java Version: 1.8.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 112115848 bytes (106 MB) / 303230976 bytes (289 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 9.18 Powered by Forge 11.15.0.1635 Optifine OptiFine_1.8.8_HD_U_G7 3 mods loaded, 3 mods active
	States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
	UCH	mcp{9.18} [Minecraft Coder Pack] (minecraft.jar) 
	UCH	FML{8.0.99.99} [Forge Mod Loader] (forge-1.8.8-11.15.0.1635-1.8.8.jar) 
	UCH	Forge{11.15.0.1635} [Minecraft Forge] (forge-1.8.8-11.15.0.1635-1.8.8.jar) 
	Loaded coremods (and transformers): 
	GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.5.0 NVIDIA 361.43' Renderer: 'GeForce GTX 780M/PCIe/SSE2'
	Launched Version: 1.8.8-forge1.8.8-11.15.0.1635-1.8.8
	LWJGL: 2.9.4
	OpenGL: GeForce GTX 780M/PCIe/SSE2 GL version 4.5.0 NVIDIA 361.43, 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: No
	Is Modded: Definitely; Client brand changed to 'fml,forge'
	Type: Client (map_client.txt)
	Resource Packs: 
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	CPU: 8x Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz

You may want to try using different versions of optifine/forge. The versions you used may not be compatible.