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i was just making an modpack, and i added pixelmon, and pixelmon crashed the modpack, can someone help me?

The crash report:

WARNING: coremods are present:
Java8CheckerCoremod (Pixelmon-1.8.9-4.2.7-universal.jar)
Contact their authors BEFORE contacting forge

// There are four lights!

Time: 22/07/16 22:28
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_110549_a(TextureManager.java:144)
at net.minecraft.client.resources.SimpleReloadableResourceManager.func_110544_b(SimpleReloadableResourceManager.java:130)
at net.minecraft.client.resources.SimpleReloadableResourceManager.func_110541_a(SimpleReloadableResourceManager.java:111)
at net.minecraft.client.Minecraft.func_110436_a(Minecraft.java:740)
at net.minecraftforge.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:326)
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(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/font/ascii.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_110549_a(TextureManager.java:144)
at net.minecraft.client.resources.SimpleReloadableResourceManager.func_110544_b(SimpleReloadableResourceManager.java:130)
at net.minecraft.client.resources.SimpleReloadableResourceManager.func_110541_a(SimpleReloadableResourceManager.java:111)
at net.minecraft.client.Minecraft.func_110436_a(Minecraft.java:740)
at net.minecraftforge.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:326)
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(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: 27823712 bytes (26 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: 0, tallocated: 0
FML: MCP 9.19 Powered by Forge 11.15.1.1902 11 mods loaded, 11 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJA mcp{9.19} [Minecraft Coder Pack] (minecraft.jar)
UCHIJA FML{8.0.99.99} [Forge Mod Loader] (forge-1.8.9-11.15.1.1902-1.8.9.jar)
UCHIJA Forge{11.15.1.1902} [Minecraft Forge] (forge-1.8.9-11.15.1.1902-1.8.9.jar)
UCHIJA IronChest{6.0.125.770} [Iron Chest] (ironchest-1.8.9-6.0.125.770.jar)
UCHIJA JEI{2.28.18.186} [Just Enough Items] (jei_1.8.9-2.28.18.186.jar)
UCHIJA journeymap{1.8.9-5.2.4} [JourneyMap] (journeymap-1.8.9-5.2.4-unlimited.jar)
UCHIJA mantle{1.8.9-0.9.2.jenkins102} [Mantle] (Mantle-1.8.9-0.9.2.jar)
UCHIJA pixelmon{4.2.7} [Pixelmon] (Pixelmon-1.8.9-4.2.7-universal.jar)
UCHIJA tconstruct{1.8.9-2.2.1.jenkins1005} [Tinkers' Construct] (TConstruct-1.8.9-2.2.1.jar)
UCHIJA VeinMiner{0.34.1_1.8.9-9901a41} [Vein Miner] (VeinMiner-0.34.1-1.8.9r552+9901a41.jar)
UCHIJA VeinMinerModSupport{0.34.1_1.8.9-9901a41} [Mod Support] (VeinMiner-0.34.1-1.8.9r552+9901a41.jar)
Loaded coremods (and transformers):
Java8CheckerCoremod (Pixelmon-1.8.9-4.2.7-universal.jar)

Pulsar/tconstruct loaded Pulses:
- TinkerCommons (Enabled/Forced)
- TinkerWorld (Enabled/Not Forced)
- TinkerTools (Enabled/Not Forced)
- TinkerSmeltery (Enabled/Not Forced)
- TinkerGadgets (Enabled/Not Forced)
- TinkerOredict (Enabled/Forced)
- TinkerIntegration (Enabled/Forced)
- TinkerFluids (Enabled/Forced)
- TinkerMaterials (Enabled/Forced)

Launched Version: 1.8.9-forge1.8.9-11.15.1.1902-1.8.9
LWJGL: 2.9.4
OpenGL: Intel(R) HD Graphics 4000 GL version 4.0.0 - Build 10.18.10.4242, Intel
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: 4x Intel(R) Core(TM) i3-3110M CPU @ 2.40GHz

Seem like you've ran out of memory.

Try allocating more RAM, as Pixelmon uses up a lot.