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So I downloaded Forge 1.8.9 with the corresponding Pixelmon version. I get to Building Terrain and then no text. Finally it says "Shutting down internal servers". I'll post the logs to see if anyone can help

---- Minecraft Crash Report ----

WARNING: coremods are present:
Java8CheckerCoremod (Pixelmon-1.8.9-4.2.3-universal.jar)
Contact their authors BEFORE contacting forge

// Would you like a cupcake?

Time: 7/13/16 12:56 PM
Description: Registering texture

java.lang.OutOfMemoryError: Java heap space
at net.minecraft.client.renderer.texture.TextureUtil.func_110993_a(TextureUtil.java:231)
at net.minecraft.client.renderer.texture.TextureUtil.func_110995_a(TextureUtil.java:222)
at net.minecraft.client.renderer.texture.TextureUtil.func_110989_a(TextureUtil.java:190)
at net.minecraft.client.renderer.texture.SimpleTexture.func_110551_a(SourceFile:47)
at net.minecraft.client.renderer.texture.TextureManager.func_110579_a(TextureManager.java:67)
at net.minecraft.client.renderer.texture.TextureManager.func_110577_a(TextureManager.java:42)
at net.minecraft.client.renderer.RenderGlobal.func_174976_a(RenderGlobal.java:1282)
at net.minecraft.client.renderer.EntityRenderer.func_175068_a(EntityRenderer.java:1266)
at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1229)
at net.minecraft.client.renderer.EntityRenderer.func_181560_a(EntityRenderer.java:1057)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1051)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:349)
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.minecraft.client.renderer.texture.TextureUtil.func_110993_a(TextureUtil.java:231)
at net.minecraft.client.renderer.texture.TextureUtil.func_110995_a(TextureUtil.java:222)
at net.minecraft.client.renderer.texture.TextureUtil.func_110989_a(TextureUtil.java:190)
at net.minecraft.client.renderer.texture.SimpleTexture.func_110551_a(SourceFile:47)

-- Resource location being registered --
Details:
Resource location: minecraft:textures/environment/sun.png
Texture object class: net.minecraft.client.renderer.texture.SimpleTexture
Stacktrace:
at net.minecraft.client.renderer.texture.TextureManager.func_110579_a(TextureManager.java:67)
at net.minecraft.client.renderer.texture.TextureManager.func_110577_a(TextureManager.java:42)
at net.minecraft.client.renderer.RenderGlobal.func_174976_a(RenderGlobal.java:1282)
at net.minecraft.client.renderer.EntityRenderer.func_175068_a(EntityRenderer.java:1266)
at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1229)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityPlayerSP['venomous_vader'/186, l='MpServer', x=8.50, y=65.00, z=8.50]]
Chunk stats: MultiplayerChunkCache: 0, 0
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: 8.00,64.00,8.00 - World: (8,64,8), Chunk: (at 8,4,8 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 2 game time, 2 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 1 total; [EntityPlayerSP['venomous_vader'/186, l='MpServer', x=8.50, y=65.00, z=8.50]]
Retry entities: 0 total; []
Server brand: ~~NULL~~
Server type: Integrated singleplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:347)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2536)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:370)
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: 1.8.9
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: 9396960 bytes (8 MB) / 1060372480 bytes (1011 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: 13, tallocated: 95
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
UCHIJAAAA mcp{9.19} [Minecraft Coder Pack] (minecraft.jar)
UCHIJAAAA FML{8.0.99.99} [Forge Mod Loader] (forge-1.8.9-11.15.1.1722.jar)
UCHIJAAAA Forge{11.15.1.1722} [Minecraft Forge] (forge-1.8.9-11.15.1.1722.jar)
UCHIJAAAA pixelmon{4.2.3} [Pixelmon] (Pixelmon-1.8.9-4.2.3-universal.jar)
Loaded coremods (and transformers):
Java8CheckerCoremod (Pixelmon-1.8.9-4.2.3-universal.jar)

GL info: ' Vendor: 'ATI Technologies Inc.' Version: '4.5.13441 Compatibility Profile Context 16.200.1035.1001' Renderer: 'AMD Radeon (TM) R9 390 Series'
Launched Version: 1.8.9-forge1.8.9-11.15.1.1722
LWJGL: 2.9.4
OpenGL: AMD Radeon (TM) R9 390 Series GL version 4.5.13441 Compatibility Profile Context 16.200.1035.1001, ATI Technologies Inc.
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:
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 8x Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz

Wow thx m8