Minecraft CurseForge

enter minecraft perfect but when I step 4 minutes appeared an error

---- Minecraft Crash Report ----
// Oops.

Time: 19/04/16 02:27 PM
Description: Exception in server tick loop

java.lang.OutOfMemoryError: unable to create new native thread
at java.lang.Thread.start0(Native Method)
at java.lang.Thread.start(Unknown Source)
at atomicstryker.ruins.common.RuinGenerator.flushPosFile(RuinGenerator.java:74)
at atomicstryker.ruins.common.RuinsMod.eventWorldSave(RuinsMod.java:116)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_267_RuinsMod_eventWorldSave_Save.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:140)
at net.minecraft.world.WorldServer.func_73044_a(WorldServer.java:810)
at net.minecraft.server.MinecraftServer.func_71267_a(MinecraftServer.java:318)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:569)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:111)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

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: 1.7.10
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.8.0_73, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 274116704 bytes (261 MB) / 782413824 bytes (746 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1614 56 mods loaded, 56 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{9.05} [Minecraft Coder Pack] (minecraft.jar)
UCHIJAAAA FML{7.10.99.99} [Forge Mod Loader] (forge-1.7.10-10.13.4.1614-1.7.10.jar)
UCHIJAAAA Forge{10.13.4.1614} [Minecraft Forge] (forge-1.7.10-10.13.4.1614-1.7.10.jar)
UCHIJAAAA CodeChickenCore{1.0.4.29} [CodeChicken Core] (minecraft.jar)
UCHIJAAAA <DragonAPI ASM>{0} [DragonAPI ASM Data Initialization] (minecraft.jar)
UCHIJAAAA NotEnoughItems{1.0.3.74} [Not Enough Items] (NotEnoughItems-1.7.10-1.0.3.74-universal.jar)
UCHIJAAAA HxCCore-ASM{1.11.0} [HxCKDMS Core ASM] (minecraft.jar)
UCHIJAAAA netheressence{2.0.0} [Nether Essence] ([1.7.10]Nether Essence 2.0.0.jar)
UCHIJAAAA nevermine{1.1.1} [Nevermine] (AdventOfAscensionV2.0.jar)
UCHIJAAAA brewingapi{1.2.0} [Brewing-API] (Agadars-Brewing-API-1.7.10.jar)
UCHIJAAAA gibby_dungeons{1.3} [Arcana RPG] (Arcana RPG 1.3 - 1.7.10.jar)
UCHIJAAAA archmagus{0.7.0} [Archmagus] (Archmagus-Mod-1.7.10.jar)
UCHIJAAAA bis{3.1.6} [Back in Slime Mod] (Back In Slime-1.7.10-3.1.6.jar)
UCHIJAAAA bunkermod{1.1} [Bunker Mod] (Bunker-Mod-1.7.10.jar)
UCHIJAAAA CosmeticArmor{1.0.3} [Cosmetic Armor] (CosmeticArmor-1.7.10-1.0.3.B5-universal.jar)
UCHIJAAAA DamageIndicatorsMod{3.2.0} [Damage Indicators] (Damage Indicators 1.7.10.jar)
UCHIJAAAA DlcGods{2.0} [DlcGods] (Dlc-Eternal-Swords-God-Mod-1.7.10.zip)
UCHIJAAAA dldungeonsjdg{1.8.9} [Doomlike Dungeons] (Doomlike-Dungeons-Mod-1.7.10.jar)
UCHIJAAAA Mantle{1.7.10-0.3.1.jenkins180} [Mantle] (Mantle-mc1.7.10-0.3.1.jar)
UCHIJAAAA Natura{2.2.0} [Natura] (natura-1.7.10-2.2.0.1.jar)
UCHIJAAAA DragonAPI{release} [DragonAPI] (DragonAPI-1.7.10.jar)
UCHIJAAAA mwaw{1.7.10-0.0.7} [Elemental Witch Mod] (Elemental-Witch-Mod-1.7.10.jar)
UCHIJAAAA eplus{1.7.10-3.0.1} [Enchanting Plus] (EnchantingPlus-1.7.10-3.0.1.jar)
UCHIJAAAA enderutilities{0.1.1.1} [Ender Utilities] (Ender-Utilities-Mod-1.7.10.zip)
UCHIJAAAA EternalSwords{7.0.2} [EternalSwords] (Eternal-Swords-Mod-1.7.10.zip)
UCHIJAAAA examplemod{1.0} [examplemod] (Extra-Doors-Mod-1.7.10.jar)
UCHIJAAAA extradoors{1.5.1} [Extra Doors] (Extra-Doors-Mod-1.7.10.jar)
UCHIJAAAA meteors{2.13} [Falling Meteors] (Falling-Meteors-Mod-1.7.10.jar)
UCHIJAAAA farlanders{1.2b} [The Farlanders] (Farlanders-Mod-1.7.10.jar)
UCHIJAAAA GrimoireOfGaia{1.0.0} [Grimoire of Gaia 3] (GrimoireOfGaia3-1.7.10-1.0.6.jar)
UCHIJAAAA HxCCore{1.11.0} [HxC-Core] (HxC-Core-1.7.10.jar)
UCHIJAAAA ani_koto{v1.5.5} [Kingdoms of the Overworld Mod] (Kingdoms-of-The-Overworld-Mod-1.7.10.jar)
UCHIJAAAA LavaMonsters{2.2.1} [Lava Monsters] (Lava-Monsters-Mod-1.7.10.jar)
UCHIJAAAA magicalcrops{1.7.2 - 0.1 ALPHA} [Magical Crops] (magicalcrops-1.7.10_0.1.jar)
UCHIJAAAA ForgeMultipart{1.1.2.331} [Forge Multipart] (ForgeMultipart-1.7.10-1.1.2.331-universal.jar)
UCHIJAAAA Mekanism{8.1.1} [Mekanism] (Mekanism-1.7.10-8.1.1.225.jar)
UCHIJAAAA MekanismGenerators{8.1.1} [MekanismGenerators] (MekanismGenerators-1.7.10-8.1.1.225.jar)
UCHIJAAAA MekanismTools{8.1.1} [MekanismTools] (MekanismTools-1.7.10-8.1.1.225.jar)
UCHIJAAAA cfm{3.4.4} [§9MrCrayfish's Furniture Mod] (MrCrayfishFurnitureModv3.4.4(1.7.10).jar)
UCHIJAAAA ModName{1.0.0} [ModName] (Mystical-Rpg-Mod-1.7.10.zip)
UCHIJAAAA newdungeons{0.3} [New Dungeons] (New-Dungeons-Mod-1.7.10.jar)
UCHIJAAAA NotEnoughWands{1.2.3} [Not Enough Wands] (Not-Enough-Wands-Mod-1.7.10.jar)
UCHIJAAAA ObsidianBoat{v1.3.2} [Obsidian Boat] (ObsidianBoat-1.7.10-1.3.2.jar)
UCHIJAAAA harvestcraft{1.7.10g} [Pam's HarvestCraft] (Pam's HarvestCraft 1.7.10h.jar)
UCHIJAAAA potioncore{@VERSION@} [Potion Core] (Potion-Core-1.7.10.jar)
UCHIJAAAA ProjectZulu|Core{1.7.10-1.3b} [Project Zulu 1.7.10] (Project-zulu-a-better-overworld-mod-1.7.10.jar)
UCHIJAAAA RandomThings{2.2.4} [Random Things] (Random-Things-Mod-1.7.10.jar)
UCHIJAAAA ReiMinimap{1.7.10} [Rei's Minimap] (ReiMinimap-1.7.10-3.6.jar)
UCHIJAAAA AS_Ruins{13.8} [Ruins Spawning System] (Ruins-1.7.10.jar)
UCHIJAAAA wow{2.0} [Special Forces Mod] (Special-Forces-Mod-1.7.10.jar)
UCHIJAAAA StorageDrawers{1.1.7} [Storage Drawers] (StorageDrawers-1.7.10-1.1.7.jar)
UCHIJAAAA njaymod_4{1.1.0} [NJay's Unicorn Mod] (Unicorn-Mod-1.7.10.jar)
UCHIJAAAA waterWalking{1.0} [Water Wal