I was trying to get into pixelmon and the game wouldn't load at all. It was stuck for a second and after a while it crashed. Here is my crash report if it helps at all

---- Minecraft Crash Report ----
// I feel sad now :(

Time: 6/7/17 5:03 PM
Description: There was a severe problem during mod loading that has caused the game to fail

net.minecraftforge.fml.common.LoaderExceptionModCrash: Caught exception from Pixelmon (pixelmon)
Caused by: java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOfRange(Arrays.java:3664)
at java.lang.String.<init>(String.java:201)
at java.io.DataInputStream.readUTF(DataInputStream.java:661)
at java.io.DataInputStream.readUTF(DataInputStream.java:564)
at net.minecraft.nbt.NBTTagCompound.func_152448_b(NBTTagCompound.java:465)
at net.minecraft.nbt.NBTTagCompound.func_152446_a(NBTTagCompound.java:47)
at net.minecraft.nbt.NBTTagCompound.func_152449_a(NBTTagCompound.java:475)
at net.minecraft.nbt.NBTTagCompound.func_152446_a(NBTTagCompound.java:49)
at net.minecraft.nbt.CompressedStreamTools.func_152455_a(CompressedStreamTools.java:132)
at net.minecraft.nbt.CompressedStreamTools.func_152456_a(CompressedStreamTools.java:87)
at net.minecraft.nbt.CompressedStreamTools.func_74794_a(CompressedStreamTools.java:82)
at com.pixelmonmod.pixelmon.worldGeneration.structure.StructureRegistry.loadSnapshot(StructureRegistry.java:407)
at com.pixelmonmod.pixelmon.worldGeneration.structure.StructureRegistry.registerGym(StructureRegistry.java:306)
at com.pixelmonmod.pixelmon.worldGeneration.structure.StructureRegistry.registerStructures(StructureRegistry.java:111)
at com.pixelmonmod.pixelmon.RegistryHelper.init(RegistryHelper.java:84)
at com.pixelmonmod.pixelmon.Pixelmon.init(Pixelmon.java:128)
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.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:600)
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 com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)
at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
at com.google.common.eventbus.EventBus.post(EventBus.java:275)
at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:243)
at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:221)


A detailed walkthrough of the error, its code path and all known details is as follows:
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-- System Details --
Details:
Minecraft Version: 1.10.2
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: 486064 bytes (0 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 9.32 Powered by Forge 12.18.3.2185 5 mods loaded, 5 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-1.10.2-12.18.3.2185.jar)
UCHI Forge{12.18.3.2185} [Minecraft Forge] (forge-1.10.2-12.18.3.2185.jar)
UCHI mercurius_updater{1.0} [mercurius_updater] (MercuriusUpdater-1.10.2.jar)
UCHE pixelmon{5.0.4} [Pixelmon] (Pixelmon-1.10.2-5.0.4-universal.jar)
Loaded coremods (and transformers):