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I've had a very big problem recently where i can't play a modpack that i made on the Curse client. It opens up the minecraft title screen and i try to play a single player world i made but it always crashes giving me this report:

---- Minecraft Crash Report ----
// Don't be sad, have a hug! <3

Time: 9/17/16 8:31 PM
Description: Exception preparing structure feature

java.lang.OutOfMemoryError: Java heap space
at net.minecraft.world.gen.layer.IntCache.func_76445_a(SourceFile:39)
at net.minecraft.world.gen.layer.GenLayerZoom.func_75904_a(SourceFile:25)
at net.minecraft.world.gen.layer.GenLayerZoom.func_75904_a(SourceFile:20)
at biomesoplenty.common.world.layer.GenLayerMutationBOP.func_75904_a(GenLayerMutationBOP.java:30)
at biomesoplenty.common.world.layer.GenLayerSubBiome.func_75904_a(GenLayerSubBiome.java:34)
at net.minecraft.world.gen.layer.GenLayerRareBiome.func_75904_a(SourceFile:13)
at net.minecraft.world.gen.layer.GenLayerZoom.func_75904_a(SourceFile:20)
at net.minecraft.world.gen.layer.GenLayerAddIsland.func_75904_a(SourceFile:16)
at net.minecraft.world.gen.layer.GenLayerZoom.func_75904_a(SourceFile:20)
at biomesoplenty.common.world.layer.GenLayerShoreBOP.func_75904_a(GenLayerShoreBOP.java:22)
at net.minecraft.world.gen.layer.GenLayerZoom.func_75904_a(SourceFile:20)
at net.minecraft.world.gen.layer.GenLayerZoom.func_75904_a(SourceFile:20)
at net.minecraft.world.gen.layer.GenLayerSmooth.func_75904_a(SourceFile:15)
at biomesoplenty.common.world.layer.GenLayerRiverMixBOP.func_75904_a(GenLayerRiverMixBOP.java:34)
at net.minecraft.world.biome.WorldChunkManager.func_150795_a(WorldChunkManager.java:221)
at biomesoplenty.common.world.WorldChunkManagerBOP.func_150795_a(WorldChunkManagerBOP.java:49)
at net.minecraft.world.gen.structure.MapGenStronghold.func_75047_a(MapGenStronghold.java:95)
at net.minecraft.world.gen.structure.MapGenStructure.func_151538_a(MapGenStructure.java:38)
at net.minecraft.world.gen.MapGenBase.func_151539_a(SourceFile:30)
at net.minecraft.world.gen.ChunkProviderGenerate.func_73154_d(ChunkProviderGenerate.java:222)
at net.minecraft.world.gen.ChunkProviderServer.originalLoadChunk(ChunkProviderServer.java:172)
at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:131)
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:101)
at net.minecraft.world.gen.ChunkProviderServer.func_73154_d(ChunkProviderServer.java:199)
at net.minecraft.world.World.func_72964_e(World.java:419)
at net.minecraft.world.World.func_147439_a(World.java:345)
at net.minecraft.world.World.func_147437_c(World.java:365)
at biomesoplenty.common.world.WorldProviderSurfaceBOP.getTopBlockCoord(WorldProviderSurfaceBOP.java:41)
at biomesoplenty.common.world.WorldProviderSurfaceBOP.func_76566_a(WorldProviderSurfaceBOP.java:14)
at net.minecraft.world.WorldServer.func_73052_b(WorldServer.java:749)
at net.minecraft.world.WorldServer.func_72963_a(WorldServer.java:715)
at net.minecraft.world.World.<init>(World.java:260)

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

-- Head --
Stacktrace:
at net.minecraft.world.gen.layer.IntCache.func_76445_a(SourceFile:39)
at net.minecraft.world.gen.layer.GenLayerZoom.func_75904_a(SourceFile:25)
at net.minecraft.world.gen.layer.GenLayerZoom.func_75904_a(SourceFile:20)
at biomesoplenty.common.world.layer.GenLayerMutationBOP.func_75904_a(GenLayerMutationBOP.java:30)
at biomesoplenty.common.world.layer.GenLayerSubBiome.func_75904_a(GenLayerSubBiome.java:34)
at net.minecraft.world.gen.layer.GenLayerRareBiome.func_75904_a(SourceFile:13)
at net.minecraft.world.gen.layer.GenLayerZoom.func_75904_a(SourceFile:20)
at net.minecraft.world.gen.layer.GenLayerAddIsland.func_75904_a(SourceFile:16)
at net.minecraft.world.gen.layer.GenLayerZoom.func_75904_a(SourceFile:20)
at biomesoplenty.common.world.layer.GenLayerShoreBOP.func_75904_a(GenLayerShoreBOP.java:22)
at net.minecraft.world.gen.layer.GenLayerZoom.func_75904_a(SourceFile:20)
at net.minecraft.world.gen.layer.GenLayerZoom.func_75904_a(SourceFile:20)

-- Feature being prepared --
Details:
Is feature chunk: ~~ERROR~~ OutOfMemoryError: Java heap space
Chunk location: 4,-1
Chunk pos hash: -4294967292
Structure type: net.minecraft.world.gen.structure.MapGenStronghold
Stacktrace:
at net.minecraft.world.gen.structure.MapGenStructure.func_151538_a(MapGenStructure.java:48)
at net.minecraft.world.gen.MapGenBase.func_151539_a(SourceFile:30)
at net.minecraft.world.gen.ChunkProviderGenerate.func_73154_d(ChunkProviderGenerate.java:222)
at net.minecraft.world.gen.ChunkProviderServer.originalLoadChunk(ChunkProviderServer.java:172)
at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:131)
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:101)
at net.minecraft.world.gen.ChunkProviderServer.func_73154_d(ChunkProviderServer.java:199)
at net.minecraft.world.World.func_72964_e(World.java:419)
at net.minecraft.world.World.func_147439_a(World.java:345)
at net.minecraft.world.World.func_147437_c(World.java:365)
at biomesoplenty.common.world.WorldProviderSurfaceBOP.getTopBlockCoord(WorldProviderSurfaceBOP.java:41)
at biomesoplenty.common.world.WorldProviderSurfaceBOP.func_76566_a(WorldProviderSurfaceBOP.java:14)
at net.minecraft.world.WorldServer.func_73052_b(WorldServer.java:749)
at net.minecraft.world.WorldServer.func_72963_a(WorldServer.java:715)
at net.minecraft.world.World.<init>(World.java:260)
at net.minecraft.world.WorldServer.<init>(WorldServer.java:97)
at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:62)
at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:92)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:387)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

-- Chunk to be generated --
Details:
Location: 12,7
Position hash: 30064771084
Generator: RandomLevelSource

-- Requested block coordinates --
Details:
Found chunk: true
Location: World: (192,64,124), Chunk: (at 0,4,12 in 12,7; contains blocks 192,0,112 to 207,255,127), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)

-- Affected level --
Details:
Level name: Survival#1
All players: 0 total; []
Chunk stats: ServerChunkCache: 0 Drop: 0
Level seed: -1142336277436131303
Level generator: ID 04 - BIOMESOP, ver 0. Features enabled: true
Level generator options:
Level spawn location: World: (0,0,0), Chunk: (at 0,0,0 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: 0 game time, 0 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.8.0_101, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 30896720 bytes (29 MB) / 239075328 bytes (228 MB) up to 239075328 bytes (228 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3072m -Xms256m -XX:PermSize=256m -Xmx3072M -Xmx256M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 67, allocated: 22, tallocated: 29
FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1614 24 mods loaded, 24 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJAA mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
UCHIJAA FML{7.10.99.99} [Forge Mod Loader] (forge-1.7.10-10.13.4.1614-1.7.10.jar)
UCHIJAA Forge{10.13.4.1614} [Minecraft Forge] (forge-1.7.10-10.13.4.1614-1.7.10.jar)
UCHIJAA appliedenergistics2-core{rv3-beta-6} [Applied Energistics 2 Core] (minecraft.jar)
UCHIJAA CodeChickenCore{1.0.7.47} [CodeChicken Core] (minecraft.jar)
UCHIJAA NotEnoughItems{1.0.5.120} [Not Enough Items] (NotEnoughItems-1.7.10-1.0.5.120-universal.jar)
UCHIJAA <CoFH ASM>{000} [CoFH ASM] (minecraft.jar)
UCHIJAA appliedenergistics2{rv3-beta-6} [Applied Energistics 2] (appliedenergistics2-rv3-beta-6.jar)
UCHIJAA Mantle{1.7.10-0.3.2.jenkins191} [Mantle] (Mantle-1.7.10-0.3.2b.jar)
UCHIJAA Natura{2.2.0} [Natura] (natura-1.7.10-2.2.0.1.jar)
UCHIJAA BiomesOPlenty{2.1.0} [Biomes O' Plenty] (BiomesOPlenty-1.7.10-2.1.0.2027-universal.jar)
UCHIJAA CoFHCore{1.7.10R3.1.3} [CoFH Core] (CoFHCore-[1.7.10]3.1.3-327.jar)
UCHIJAA ComputerCraft{1.75} [ComputerCraft] (ComputerCraft1.75.jar)
UCHIJAA ThermalFoundation{1.7.10R1.2.5} [Thermal Foundation] (ThermalFoundation-[1.7.10]1.2.5-115.jar)
UCHIJAA ThermalExpansion{1.7.10R4.1.4} [Thermal Expansion] (ThermalExpansion-[1.7.10]4.1.4-247.jar)
UCHIJAA Waila{1.5.10} [Waila] (Waila-1.5.10_1.7.10.jar)
UCHIJAA TConstruct{1.7.10-1.8.8.build988} [Tinkers' Construct] (TConstruct-1.7.10-1.8.8.jar)
UCHIJAA ExtraTiC{1.4.6} [ExtraTiC] (ExtraTiC-1.7.10-1.4.6.jar)
UCHIJAA iChunUtil{4.2.2} [iChunUtil] (iChunUtil-4.2.2.jar)
UCHIJAA IronChest{6.0.60.741} [Iron Chest] (ironchest-1.7.10-6.0.60.741-universal.jar)
UCHIJAA journeymap{5.1.4p1} [JourneyMap] (journeymap-1.7.10-5.1.4p1-unlimited.jar)
UCHIJAA ThermalDynamics{1.7.10R1.2.0} [Thermal Dynamics] (ThermalDynamics-[1.7.10]1.2.0-171.jar)
UCHIJAA TiCTooltips{1.2.5} [TiC Tooltips] (TiCTooltips-mc1.7.10-1.2.5.jar)
UCHIJAA WailaHarvestability{1.1.6} [Waila Harvestability] (WailaHarvestability-mc1.7.10-1.1.6.jar)
GL info: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
AE2 Version: beta rv3-beta-6 for Forge 10.13.4.1448
Mantle Environment: Environment healthy.
CoFHCore: -[1.7.10]3.1.3-327
ThermalFoundation: -[1.7.10]1.2.5-115
ThermalExpansion: -[1.7.10]4.1.4-247
TConstruct Environment: Environment healthy.
ThermalDynamics: -[1.7.10]1.2.0-171
AE2 Integration: IC2:OFF, RotaryCraft:OFF, RC:OFF, BuildCraftCore:OFF, BuildCraftTransport:OFF, BuildCraftBuilder:OFF, RF:ON, RFItem:ON, MFR:OFF, DSU:ON, FZ:OFF, FMP:OFF, RB:OFF, CLApi:OFF, Waila:ON, InvTweaks:OFF, NEI:ON, CraftGuide:OFF, Mekanism:OFF, ImmibisMicroblocks:OFF, BetterStorage:OFF, OpenComputers:OFF, PneumaticCraft:OFF
Profiler Position: N/A (disabled)
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'

I have no idea what i'm doing wrong. I've tried allocating more RAM, I've tried reinstalling it, and I've tried deleting and reinstalling the Curse client. I hope someone can help me with this because i'm at the point of breaking something.

Quote from M0NK3Y5_K1LL»

java.lang.OutOfMemoryError: Java heap space

It is clearly running out of memory. I noticed that you have a lot of different Xmx values on your jvm flags, get rid of all except one.

How do I do that though?

Quote from webrosc»

totally right, the game is only being allowed 256M at the moment

Quote from M0NK3Y5_K1LL»

How do I do that though?

I couldn't tell you specifics because I don't use the curse launcher but somewhere should be a place to set jvm arguments and from there you should delete all but one -Xmx and it's set value and use the one -Xmx you have left to set what amount of RAM you want to allocate.

Quote from scarycreepa»

I couldn't tell you specifics because I don't use the curse launcher but somewhere should be a place to set jvm arguments and from there you should delete all but one -Xmx and it's set value and use the one -Xmx you have left to set what amount of RAM you want to allocate.

Quote from M0NK3Y5_K1LL»

I have -Xmx3072M for allocating ram.

This is what your jvm arguments look like:

-XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3072m -Xms256m -XX:PermSize=256m -Xmx3072M -Xmx256M

if you would look, you have three different Xmx arguments. the one that Minecraft will take is the last one (which is -Xmx256M). you, at least, need to delete the -Xmx256M. If it is still crashing then look at the crash log and see if it says "java.lang.OutOfMemoryError: Java heap space" at the top. If it doesn't then post it here. If it does then you have done something wrong. Either Curse is, for some reason, not letting you put more RAM or it is your own doing.

Edit:

this is what your jvm arguments should look like:

-XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3072m -Xms256m -XX:PermSize=256m

Quote from scarycreepa»

This is what your jvm arguments look like: if you would look, you have three different Xmx arguments. the one that Minecraft will take is the last one (which is -Xmx256M). you, at least, need to delete the -Xmx256M. If it is still crashing then look at the crash log and see if it says "java.lang.OutOfMemoryError: Java heap space" at the top. If it doesn't then post it here. If it does then you have done something wrong. Either Curse is, for some reason, not letting you put more RAM or it is your own doing.

Alright. I went and downloaded Curse's crappy client (I think I have committed a crime on here for saying that) and the best thing I can tell you with this thing is to go to the gear down on the bottom left hand corner and click on it. Then go into the Minecraft option and scroll all the way down to "additional java arguments" and type into there -Xmx3072m and hope that Curse decides to put it at the end of the arguments. If that doesn't work then the best thing I can tell you is to go on the normal Minecraft launcher.

Quote from scarycreepa»

Alright. I went and downloaded Curse's crappy client (I think I have committed a crime on here for saying that) and the best thing I can tell you with this thing is to go to the gear down on the bottom left hand corner and click on it. Then go into the Minecraft option and scroll all the way down to "additional java arguments" and type into there -Xmx3072m and hope that Curse decides to put it at the end of the arguments. If that doesn't work then the best thing I can tell you is to go on the normal Minecraft launcher.

Quote from M0NK3Y5_K1LL»

What does "-XX:PermSize=3072m" mean?

PermSize shouldn't be messed with unless you know what you are doing. I would set that back to what is listed in the crash report which is "-XX:PermSize=256m". As to the answer to your question a simple google search can get you to this:

I just copy pasted this. I will not explain things in here because if you do not already know then you do not need to know.

Quote from grimallq»

PermGen arguments are obsolete and do nothing with Java 8+. Remove them.

Quote from grimallq»

Permanent Generation.

Special memory area in Java for storing compiled program code. In Java 7 or older it had to be manually set as very large programs (say modded Minecraft) could exceed the default size limit.

In Java 8 (or newer) this is handled automatically and under a different name. As such any PermGen argument will be ignored by Java 8+.

Quote from grimallq»

Permanent Generation.

Special memory area in Java for storing compiled program code. In Java 7 or older it had to be manually set as very large programs (say modded Minecraft) could exceed the default size limit.

In Java 8 (or newer) this is handled automatically and under a different name. As such any PermGen argument will be ignored by Java 8+.