Help Survival crashes but servers work ?

everytime i try to play survival this happens but i can play fine on servers i dont know what do it


---- Minecraft Crash Report ----
// I let you down. Sorry

Time: 09/06/16 17:31
Description: Exception in server tick loop

java.lang.NullPointerException: Exception in server tick loop
at drzhark.customspawner.EventHooks.structureMapGen(EventHooks.java:166)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_7_EventHooks_structureMapGen_InitMapGenEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:55)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:138)
at net.minecraftforge.event.terraingen.TerrainGen.getModdedMapGen(TerrainGen.java:28)
at net.minecraft.world.gen.ChunkProviderGenerate.<init>(ChunkProviderGenerate.java:66)
at net.minecraft.world.WorldType.getChunkGenerator(WorldType.java:149)
at net.minecraft.world.WorldProvider.func_76555_c(WorldProvider.java:60)
at net.minecraft.world.WorldServer.func_72970_h(WorldServer.java:748)
at net.minecraft.world.WorldServer.<init>(WorldServer.java:118)
at WorldServerOF.<init>(WorldServerOF.java:25)
at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:85)
at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:203)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:438)
at java.lang.Thread.run(Thread.java:745)


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

-- System Details --
Details:
Minecraft Version: 1.8
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: 173676264 bytes (165 MB) / 458113024 bytes (436 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 v9.10 FML v8.0.26.1299 Minecraft Forge 11.14.0.1299 Optifine OptiFine_1.8_HD_U_H5 8 mods loaded, 8 mods active
mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
FML{8.0.26.1299} [Forge Mod Loader] (forge-1.8-11.14.0.1299.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Forge{11.14.0.1299} [Minecraft Forge] (forge-1.8-11.14.0.1299.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
CodeChickenCore{1.0.5.34} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
NotEnoughItems{1.0.5.104} [Not Enough Items] (NotEnoughItems-1.8-1.0.5.104-universal (1).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
CustomSpawner{3.4.0} [DrZhark's CustomSpawner] (CustomMobSpawner 3.4.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
DamageIndicatorsMod{3.3.2} [Damage Indicators] (Damage-Indicators-Mod-1.8.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
MoCreatures{8.0.1} [DrZhark's Mo'Creatures Mod] (DrZhark's Mo'Creatures Mod-8.0.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Profiler Position: N/A (disabled)
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'
OptiFine Version: OptiFine_1.8_HD_U_H5
Render Distance Chunks: 2
Mipmaps: 4
Anisotropic Filtering: 1
Antialiasing: 0
Multitexture: false
Shaders: null
OpenGlVersion: 4.3.0 - Build 20.19.15.4331
OpenGlRenderer: Intel(R) HD Graphics 4400
OpenGlVendor: Intel
CpuCount: 4