When ever a mob from this mod spawns I get a crash, which has harmed several worlds that I have played on because it will, from then on, crash upon opening the world. I have tried editing the config file:

Configuration file

compatibility {
B:EnableArsMagicaSoulbound=true
B:EnableEnderIOSoulbound=true
B:EnableForestryBackpacks=true
B:SpawnMoCreaturesMobs=true
B:StoreBackpacksItems=true
B:StoreBattlegearItems=true
B:StoreBaublesItems=true
B:StoreGalacticraftItems=true
B:StoreMaricultureItems=true
B:StoreRpgInventoryItems=true
B:StoreTheCampingModItems=true
B:StoreTinkerConstructItems=true
}

general {
B:CanPlaceGravesEveryWhere=true
D:CatacombsGenerationChance=2.5E-4
B:EnableBossSpawnerCraftingRecipe=true
B:EnableCreeperStatuesRecipes=true
B:EnableMonsterSpawnerCraftingRecipe=true
B:EnableNightStone=true
B:EnableThunderStone=true
B:GenerateCatacombs=false
B:GenerateCatacombsGraveyard=false
B:GenerateCemeteries=true
B:GenerateGravesInLava=true
B:GenerateGravesInMushroomBiomes=true
B:GenerateMemorials=true
B:GeneratePetGraves=true
B:GeneratePlayerGraves=true
B:GenerateSingleGraves=true
B:GenerateSwordGraves=true
B:GenerateUndertaker=true
B:GenerateVillageMemorials=true
B:GenerateVillagerGraves=true
B:IsFogEnabled=true
I:MaximumCatacombsGenerationHeight=75
B:RemoveEmptyGraves=false
B:ReplaceHauntedChest=false

This value must be between 0 an 40(in this case all items will be stored)!

I:SavedItemsCount=40
B:ShowGravesRemovingMessages=true
B:ShowNightStoneMessage=true
I:SpawnChance=0
B:SpawnMobAtGraveDestruction=false

This value must be bigger than 600!

I:SpawnRate=1000
B:SpawnSkeletonCats=false
B:SpawnSkeletonDogs=false
B:SpawnSkullCrawlersAtMobsDeath=false
B:SpawnSkullCrawlersOnBoneBlockDestruction=false
B:SpawnZombieCats=false
B:SpawnZombieDogs=false
I:StructuresDimensionId=0
I:undertakerId=385
}

potions {
I:CursePotionEffectId=31
}

But I am still frequented by game crashes. Is there anything I can do to stop these crashes? I do have several mods but these crashes have preceded the installations of most of the mods that I currently have and every single crash has been the same. (I am using version 2.11.3 of gravestones)

---- Minecraft Crash Report ----
// This is a token for 1 free hug. Redeem at your nearest Mojangsta: [HUG]

Time: 3/29/15 11:28 AM
Description: Unexpected error

java.lang.NullPointerException: Unexpected error
at net.minecraft.client.network.NetHandlerPlayClient.func_147281_a(NetHandlerPlayClient.java:744)
at net.minecraft.network.play.server.S0FPacketSpawnMob.func_148833_a(SourceFile:97)
at net.minecraft.network.play.server.S0FPacketSpawnMob.func_148833_a(SourceFile:15)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212)
at net.minecraft.client.multiplayer.PlayerControllerMP.func_78765_e(PlayerControllerMP.java:273)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1590)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:961)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:887)
at net.minecraft.client.main.Main.main(SourceFile:148)
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:134)
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.network.NetHandlerPlayClient.func_147281_a(NetHandlerPlayClient.java:744)
at net.minecraft.network.play.server.S0FPacketSpawnMob.func_148833_a(SourceFile:97)
at net.minecraft.network.play.server.S0FPacketSpawnMob.func_148833_a(SourceFile:15)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212)
at net.minecraft.client.multiplayer.PlayerControllerMP.func_78765_e(PlayerControllerMP.java:273)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['corwinseeker'/1784, l='MpServer', x=36.00, y=77.12, z=55.00]]
Chunk stats: MultiplayerChunkCache: 80, 80
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: 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: 789262 game time, 805883 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: 37 total; [EntityPigZombie['Zombie Pigman'/73537, l='MpServer', x=61.50, y=33.00, z=34.50], EntityPigZombie['Zombie Pigman'/73543, l='MpServer', x=40.50, y=23.00, z=54.50], EntityPigZombie['Zombie Pigman'/73545, l='MpServer', x=36.50, y=23.00, z=54.50], EntityBlaze['Blaze'/73609, l='MpServer', x=-22.50, y=57.00, z=32.50], EntityPigZombie['Zombie Pigman'/73544, l='MpServer', x=40.50, y=23.00, z=53.50], EntityBlaze['Blaze'/73608, l='MpServer', x=-21.50, y=57.00, z=30.50], EntityBlackWidow['Black Widow'/73547, l='MpServer', x=40.50, y=23.00, z=50.50], EntityPigZombie['Zombie Pigman'/73611, l='MpServer', x=-25.50, y=57.00, z=32.50], EntityPigZombie['Zombie Pigman'/73546, l='MpServer', x=38.50, y=23.00, z=55.50], EntityPigZombie['Zombie Pigman'/73610, l='MpServer', x=-23.50, y=57.00, z=37.50], EntityBlackWidow['Black Widow'/73549, l='MpServer', x=39.50, y=23.00, z=52.50], EntityPigZombie['Zombie Pigman'/73613, l='MpServer', x=61.50, y=34.00, z=36.50], EntityBlaze['Blaze'/73612, l='MpServer', x=-19.50, y=57.00, z=37.50], EntityPigZombie['Zombie Pigman'/73553, l='MpServer', x=35.50, y=23.00, z=52.50], EntityPigZombie['Zombie Pigman'/73552, l='MpServer', x=39.50, y=23.00, z=50.50], EntityBlackWidow['Black Widow'/73619, l='MpServer', x=57.50, y=70.00, z=23.50], EntityPigZombie['Zombie Pigman'/73554, l='MpServer', x=35.50, y=23.00, z=54.50], EntityBlackWidow['Black Widow'/73559, l='MpServer', x=80.50, y=104.00, z=116.50], EntityPigZombie['Zombie Pigman'/73624, l='MpServer', x=108.50, y=86.00, z=100.50], EntityPigZombie['Zombie Pigman'/73560, l='MpServer', x=78.50, y=104.00, z=118.50], EntityPigZombie['Zombie Pigman'/73502, l='MpServer', x=77.50, y=88.00, z=90.50], EntityBlackWidow['Black Widow'/73505, l='MpServer', x=98.44, y=83.88, z=127.53], EntityBlackWidow['Black Widow'/73632, l='MpServer', x=59.50, y=88.00, z=125.50], EntityBlackWidow['Black Widow'/73506, l='MpServer', x=95.50, y=83.00, z=123.50], EntityPigZombie['Zombie Pigman'/73637, l='MpServer', x=59.50, y=88.00, z=121.50], EntityPigZombie['Zombie Pigman'/73636, l='MpServer', x=57.50, y=88.00, z=121.50], EntityPigZombie['Zombie Pigman'/73515, l='MpServer', x=75.50, y=36.00, z=54.50], EntityPigZombie['Zombie Pigman'/73647, l='MpServer', x=105.50, y=67.00, z=12.50], EntityPigZombie['Zombie Pigman'/73649, l='MpServer', x=109.50, y=67.00, z=7.50], EntityPigZombie['Zombie Pigman'/73648, l='MpServer', x=106.50, y=67.00, z=10.50], EntityPigZombie['Zombie Pigman'/73650, l='MpServer', x=107.50, y=67.00, z=8.50], EntityClientPlayerMP['corwinseeker'/1784, l='MpServer', x=36.00, y=77.12, z=55.00], EntityPigZombie['Zombie Pigman'/73525, l='MpServer', x=90.50, y=65.00, z=-9.50], EntityPigZombie['Zombie Pigman'/73526, l='MpServer', x=88.50, y=65.00, z=-12.50], EntityPigZombie['Zombie Pigman'/73599, l='MpServer', x=3.50, y=75.00, z=53.50], EntityPigZombie['Zombie Pigman'/73598, l='MpServer', x=6.50, y=75.00, z=55.50], EntityBlackWidow['Black Widow'/73534, l='MpServer', x=41.50, y=98.00, z=107.50]]
Retry entities: 0 total; []
Server brand: fml,forge
Server type: Integrated singleplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:373)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2432)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:916)
at net.minecraft.client.main.Main.main(SourceFile:148)
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:134)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 378896080 bytes (361 MB) / 884527104 bytes (843 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
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 15, tallocated: 95
FML: MCP v9.05 FML v7.10.85.1291 Minecraft Forge 10.13.2.1291 62 mods loaded, 62 mods active
mcp{9.05} Minecraft Coder Pack Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{7.10.85.1291} Forge Mod Loader Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{10.13.2.1291} Minecraft Forge Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
appliedenergistics2-core{rv1-stable-1} AppliedEnergistics2 Core Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CodeChickenCore{1.0.4.29} CodeChicken Core Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
{000} CoFH ASM Data Initialization Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
NotEnoughItems{1.0.4.90} Not Enough Items Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
lucky{5.1.0} Lucky Block Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FLabsBF{4.3} Better Furnaces Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DamageIndicatorsMod{3.2.3} Damage Indicators Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
appliedenergistics2{rv1-stable-1} Applied Energistics 2 Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Backpack{2.0.1} Backpack Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CoFHCore{1.7.10R3.0.0B9} CoFH Core Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Core{6.4.4} BuildCraft Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Transport{6.4.4} BC Transport Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Silicon{6.4.4} BC Silicon Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Builders{6.4.4} BC Builders Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Energy{6.4.4} BC Energy Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Factory{6.4.4} BC Factory Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DraconicEvolution{1.0.1-snapshot_5} Draconic Evolution Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
eplus{3.0.2-d} Enchanting Plus Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
EnderStorage{1.4.5.27} EnderStorage Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
eternalfrost{2.0b4} Eternal Frost Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ExtraUtilities{1.2.2} Extra Utilities Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
GraveStone{2.11.3} GraveStone Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
HardcoreEnderExpansion{1.7.1} [Hardcore Ender Expansion](HardcoreEnderExpansion MC-1.7.10 v1.7.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
iChunUtil{4.1.0} iChunUtil Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Hats{4.0.1} Hats Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
IC2{2.2.485-experimental} IndustrialCraft 2 Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
InfernalMobs{1.6.0} Infernal Mobs Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
IronChest{6.0.62.742} Iron Chest Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Mantle{1.7.10-0.3.1.jenkins180} Mantle Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded{1.7.10R2.8.0RC3} MineFactory Reloaded Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatAppliedEnergistics{1.7.10R2.8.0RC3} MFR Compat: Applied Energistics Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatAtum{1.7.10R2.8.0RC2} MFR Compat: Atum Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatBackTools{1.7.10R2.8.0RC3} MFR Compat: BackTools Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatBuildCraft{1.7.10R2.8.0RC3} MFR Compat: BuildCraft Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatChococraft{1.7.10R2.8.0RC2} MFR Compat: Chococraft Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatExtraBiomes{1.7.10R2.8.0RC2} MFR Compat: ExtraBiomes Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatForestry{1.7.10R2.8.0RC3} MFR Compat: Forestry Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatForgeMicroblock{1.7.10R2.8.0RC3} MFR Compat: ForgeMicroblock Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatIC2{1.7.10R2.8.0RC3} MFR Compat: IC2 Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatMystcraft{1.7.10R2.8.0RC2} MFR Compat: Mystcraft Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatPams{1.7.10R2.8.0RC2} MFR Compat: Pam's Mods Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatProjRed{1.7.10R2.8.0RC2} MFR Compat ProjectRed Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatRailcraft{1.7.10R2.8.0RC3} MFR Compat: Railcraft Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatRP2{1.7.10R2.8.0RC2} MFR Compat: RP2 Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatSufficientBiomes{1.7.10R2.8.0RC2} MFR Compat: Sufficient Biomes Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatThaumcraft{1.7.10R2.8.0RC3} MFR Compat: Thaumcraft Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatThermalExpansion{1.7.10R2.8.0RC3} MFR Compat: Thermal Expansion Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatTwilightForest{1.7.10R2.8.0RC3} MFR Compat: TwilightForest Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatVanilla{1.7.10R2.8.0RC3} MFR Compat: Vanilla Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MoreEnchants{1.3.0} MoreEnchants Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Morph{0.9.1} Morph Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MSM3{3.0.0d} More Swords 3 Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
OreSpawn{1.7.10.20.3} OreSpawn Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Waila{1.5.8} Waila Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TConstruct{1.7.10-1.6.0.build611} Tinkers' Construct Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
telepads{1.6.4 v5} Teleportation Pads Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
erebus{0.2pre11c} Erebus Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
SpecialArmor{1.7.10} [TeeLuk's SpecialArmor](TLSpecialArmor-1.7.10 %281%29.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
nolpfij_wildycraft{1.7.3} Wildycraft Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
AE2 Version: stable rv1-stable-1 for Forge 10.13.0.1187
Mantle Environment: Environment healthy.
TConstruct Environment: Environment healthy.
AE2 Integration: IC2:ON, RotaryCraft:OFF, RC:OFF, BC:ON, MJ6:OFF, MJ5:OFF, RF:ON, RFItem:ON, MFR:ON, DSU:ON, FZ:OFF, FMP:OFF, RB:OFF, CLApi:OFF, Waila:ON, InvTweaks:OFF, NEI:ON, CraftGuide:OFF, Mekanism:OFF, ImmibisMicroblocks:OFF, BetterStorage:OFF
Launched Version: 1.7.10
LWJGL: 2.9.1
OpenGL: Intel(R) HD Graphics GL version 4.0.0 - Build 10.18.10.3412, Intel
GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

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)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)