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I have Pixelmon 4.2.0 installed along with the recommended forge, however, I keep getting an error when I go to boot in the game. Anyone have any ideas why this is happening?

---- Minecraft Crash Report ----

WARNING: coremods are present:
Java8CheckerCoremod (Pixelmon-1.8.9-4.2.0-universal.jar)
Contact their authors BEFORE contacting forge

// Oops.

Time: 2/13/16 12:25 AM
Description: Initializing game

SplashProgress has detected a error loading Minecraft.
This can sometimes be caused by bad video drivers.
We have automatically disabeled the new Splash Screen in config/splash.properties.
Try reloading minecraft before reporting any errors.
net.minecraftforge.fml.client.SplashProgress$5: java.lang.IllegalStateException: Splash thread
at net.minecraftforge.fml.client.SplashProgress.disableSplash(SplashProgress.java:591)
at net.minecraftforge.fml.client.SplashProgress.finish(SplashProgress.java:583)
at net.minecraftforge.fml.client.FMLClientHandler.haltGame(FMLClientHandler.java:292)
at net.minecraftforge.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:321)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:495)
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(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.IllegalStateException: Splash thread
at net.minecraftforge.fml.client.SplashProgress.checkThreadState(SplashProgress.java:516)
at net.minecraftforge.fml.client.SplashProgress.finish(SplashProgress.java:571)
... 11 more
Caused by: java.lang.OutOfMemoryError: Java heap space
at java.lang.AbstractStringBuilder.<init>(Unknown Source)
at java.lang.StringBuilder.<init>(Unknown Source)
at net.minecraftforge.fml.client.SplashProgress$3.drawBar(SplashProgress.java:414)
at net.minecraftforge.fml.client.SplashProgress$3.run(SplashProgress.java:327)
at java.lang.Thread.run(Unknown Source)


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

-- Head --
Stacktrace:
at net.minecraftforge.fml.client.SplashProgress.disableSplash(SplashProgress.java:591)
at net.minecraftforge.fml.client.SplashProgress.finish(SplashProgress.java:583)
at net.minecraftforge.fml.client.FMLClientHandler.haltGame(FMLClientHandler.java:292)
at net.minecraftforge.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:321)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:495)

-- 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(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)

-- System Details --
Details:
Minecraft Version: 1.8.9
Operating System: Windows 8.1 (x86) version 6.3
Java Version: 1.8.0_73, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 866808 bytes (0 MB) / 523501568 bytes (499 MB) up to 523501568 bytes (499 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP 9.19 Powered by Forge 11.15.1.1722 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
UCHI mcp{9.19} [Minecraft Coder Pack] (minecraft.jar)
UCHI FML{8.0.99.99} [Forge Mod Loader] (forge-1.8.9-11.15.1.1722.jar)
UCHI Forge{11.15.1.1722} [Minecraft Forge] (forge-1.8.9-11.15.1.1722.jar)
UCHE pixelmon{4.2.0} [Pixelmon] (Pixelmon-1.8.9-4.2.0-universal.jar)
Loaded coremods (and transformers):
Java8CheckerCoremod (Pixelmon-1.8.9-4.2.0-universal.jar)

GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.5.0 NVIDIA 359.00' Renderer: 'GeForce GTX 860M/PCIe/SSE2'
Launched Version: 1.8.9-forge1.8.9-11.15.1.1722
LWJGL: 2.9.4
OpenGL: GeForce GTX 860M/PCIe/SSE2 GL version 4.5.0 NVIDIA 359.00, 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: LIFE 128x (Vers. 81).zip
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 8x Intel(R) Core(TM) i7-4710HQ CPU @ 2.50GHz