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Hi guys i am running minecraft 1.8.9. It anyone can decipher this error code and possibly what the problem is it'd be much appreciated.

---- Minecraft Crash Report ----

WARNING: coremods are present:
Java8CheckerCoremod (Pixelmon-1.8.9-4.2.2-universal.jar)
Contact their authors BEFORE contacting forge

// Ouch. That hurt

Time: 2016/08/28 2:50 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.util.Arrays.copyOf(Unknown Source)
at java.lang.AbstractStringBuilder.expandCapacity(Unknown Source)
at java.lang.AbstractStringBuilder.ensureCapacityInternal(Unknown Source)
at java.lang.AbstractStringBuilder.append(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at net.minecraftforge.fml.client.SplashProgress$3.drawBar(SplashProgress.java:414)
at net.minecraftforge.fml.client.SplashProgress$3.run(SplashProgress.java:336)
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_101, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 4744552 bytes (4 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{4.2.2} [Pixelmon] (Pixelmon-1.8.9-4.2.2-universal.jar)
Loaded coremods (and transformers):
Java8CheckerCoremod (Pixelmon-1.8.9-4.2.2-universal.jar)

GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.5.0 NVIDIA 372.54' Renderer: 'GeForce GTX 750 Ti/PCIe/SSE2'
Launched Version: 1.8.9-forge1.8.9-11.15.1.1722
LWJGL: 2.9.4
OpenGL: GeForce GTX 750 Ti/PCIe/SSE2 GL version 4.5.0 NVIDIA 372.54, 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 AMD FX(tm)-8320 Eight-Core Processor

lol are you serious? Xmx512MB

Is it definitely the ram? cause i tried that and it didnt fix the problem, i get this error: Error occurred during initialization of VM
Could not reserve enough space for 3145728KB object heap.

I have 8gigs of ram and can run games like GTA V on medium settings with no problems. Ive checking in task manager and it shows i do have all 8 gigs

Starting to worry it might be a problem with my pc but i only have this problem when trying to play pixelmon. i have no problems playing any other games including vanilla minecraft. I have 8gigs of ram and can run games like GTA V on medium settings with no problems

Ok ive managed to get it running by setting it to 1gig of ram but its not playable, it spikes from 60fps to 1 every 2 seconds. If i try set it any higher i get this error message:

Error occurred during initialization of VM
Could not reserve enough space for 2097152KB object heap.

Anyone know how to get around that?

Are there any restrictions my pc might have limiting me to the amount of ram i can use on a program?

I have java 64bit