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I installed new mods and the game was fine but it suddenly crashed then when ever I want to enter my old world I get this error or if I made a new one it crashes after few sec or 1 min can you pls help me, this is my crash report:

---- Minecraft Crash Report ----
// Why is it breaking

Time: 7/24/14 6:46 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.Minecraft.func_71407_l(Minecraft.java:2049)
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(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
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)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['iAoBox'/195, l='MpServer', x=40.42, y=78.16, z=346.70]]
Chunk stats: MultiplayerChunkCache: 95, 95
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (20,64,252), Chunk: (at 4,4,12 in 1,15; contains blocks 16,0,240 to 31,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 983 game time, 983 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: 40 total; [EntityBat['Bat'/76, l='MpServer', x=-18.63, y=23.03, z=287.53], EntityBat['Bat'/129, l='MpServer', x=97.75, y=38.09, z=406.34], EntityOrc['Orc'/197, l='MpServer', x=-12.50, y=64.00, z=463.50], EntityBat['Bat'/77, l='MpServer', x=-31.75, y=33.09, z=295.22], EntityClientPlayerMP['iAoBox'/195, l='MpServer', x=40.42, y=78.16, z=346.70], EntityBat['Bat'/78, l='MpServer', x=-17.56, y=36.41, z=303.63], EntityOrc['Orc'/199, l='MpServer', x=-15.50, y=63.00, z=469.50], EntityBat['Bat'/130, l='MpServer', x=98.03, y=37.75, z=403.41], EntityOrc['Orc'/198, l='MpServer', x=-13.50, y=64.00, z=460.50], EntityBat['Bat'/84, l='MpServer', x=-16.44, y=26.66, z=288.47], EntityTFNagaSegment['unknown'/256, l='MpServer', x=0.00, y=0.00, z=0.00], EntityTFNagaSegment['unknown'/257, l='MpServer', x=0.00, y=0.00, z=0.00], EntityBat['Bat'/95, l='MpServer', x=18.50, y=32.00, z=303.09], EntityItem['item.tile.mushroom'/94, l='MpServer', x=20.13, y=20.13, z=286.13], EntityIguana['Iguana'/89, l='MpServer', x=6.84, y=76.00, z=314.09], EntityIguana['Iguana'/88, l='MpServer', x=14.50, y=76.00, z=317.50], EntityIguana['Iguana'/91, l='MpServer', x=7.50, y=76.00, z=346.50], EntityBat['Bat'/90, l='MpServer', x=5.06, y=12.53, z=325.16], EntityIguana['Iguana'/96, l='MpServer', x=21.53, y=79.00, z=339.69], EntitySquid['Squid'/110, l='MpServer', x=78.84, y=61.38, z=366.03], EntityBat['Bat'/111, l='MpServer', x=65.28, y=38.09, z=371.25], EntitySquid['Squid'/109, l='MpServer', x=78.22, y=60.25, z=363.50], EntityBat['Bat'/107, l='MpServer', x=54.72, y=39.38, z=355.00], EntityTFNagaSegment['unknown'/254, l='MpServer', x=0.00, y=0.00, z=0.00], EntityTFNagaSegment['unknown'/255, l='MpServer', x=0.00, y=0.00, z=0.00], EntityTFNagaSegment['unknown'/252, l='MpServer', x=0.00, y=0.00, z=0.00], EntityTFNagaSegment['unknown'/253, l='MpServer', x=0.00, y=0.00, z=0.00], EntityTFNagaSegment['unknown'/250, l='MpServer', x=0.00, y=0.00, z=0.00], EntityTFNagaSegment['unknown'/251, l='MpServer', x=0.00, y=0.00, z=0.00], EntityTFNagaSegment['unknown'/248, l='MpServer', x=0.00, y=0.00, z=0.00], EntityTFNagaSegment['unknown'/249, l='MpServer', x=0.00, y=0.00, z=0.00], EntityBat['Bat'/112, l='MpServer', x=66.84, y=38.09, z=369.44], EntityTFNagaSegment['unknown'/246, l='MpServer', x=0.00, y=0.00, z=0.00], EntityTFNagaSegment['unknown'/247, l='MpServer', x=0.00, y=0.00, z=0.00], EntitySquid['Squid'/126, l='MpServer', x=85.34, y=61.34, z=368.25], EntitySquid['Squid'/125, l='MpServer', x=80.50, y=58.16, z=368.22], EntitySquid['Squid'/124, l='MpServer', x=81.06, y=59.69, z=369.94], EntitySquid['Squid'/123, l='MpServer', x=83.84, y=60.03, z=366.13], EntityBat['Bat'/122, l='MpServer', x=95.50, y=55.28, z=303.91], EntityBat['Bat'/121, l='MpServer', x=99.56, y=54.59, z=292.50]]
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(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
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 7 (amd64) version 6.1
Java Version: 1.7.0_65, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 142948616 bytes (136 MB) / 529006592 bytes (504 MB) up to 954728448 bytes (910 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: 13, tallocated: 95
FML: MCP v9.05 FML v7.10.24.1187 Minecraft Forge 10.13.0.1187 25 mods loaded, 25 mods active
mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{7.10.24.1187} [Forge Mod Loader] (forge-1.7.10-10.13.0.1187.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{10.13.0.1187} [Minecraft Forge] (forge-1.7.10-10.13.0.1187.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CodeChickenCore{1.0.1.8} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CustomLanPort{0.0.1} [CustomLanPort] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
NotEnoughItems{1.0.2.15} [Not Enough Items] (NotEnoughItems-1.7.10-1.0.2.15-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
SmartCore{1.0} [Smart Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
lucky{5.0.0} [Lucky Block] ([1-7-2]_Lucky_Block_v5-0-0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
moEatableSwords{1.7.2} [moSwords Mod Eatables] ([1.7.10] moSwords v1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
moSwords{v1} [Mo Swords Mod] ([1.7.10] moSwords v1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
animalbikes{1.7.2} [Animal Bikes] (AnimalBikes_1.7.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Backpack{2.0.0} [Backpack] (backpack-2.0.0-1.7.x.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BattleTowers{1.4.8} [Battle Towers] (BattleTowers-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
cpc{1.7.x-r76.6c6e88f} [CreepyPastaCraft] (CreepyPastaCraft-1.7.x-r76.6c6e88f-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ether{3.0} [ether] (ether-1.7.10-0.7.13.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
farlanders{1.2b} [The Farlanders] (Farlanders-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
javalcars{1.1} [JavalCars] (javalcars117823532.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MiniBosses{v1.1.2} [Mini-Bosses] (Mini-Bosses-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
cfm{3.3.2} [§6MrCrayfish's Furniture Mod] (MrCrayfishFurnitureModv3.3.2(1.7.2).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
parachutemod{1.7.10} [Parachute Mod] (Parachute-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
reptilemod{1.7.10} [Reptile Mod] (Reptile-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
AS_Ruins{13.5} [Ruins Spawning System] (Ruins-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
RioV{v2.2.3} [The Mists of RioV] (The Mists of RioV - v2.2.3.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TwilightForest{2.2.0} [The Twilight Forest] (twilightforest-1.7.2-2.2.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
AS_UpdateCheck{1.1.6} [AtomicStryker Update Check Mod] (UpdateCheckerMod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Launched Version: 1.7.10-Forge10.13.0.1187
LWJGL: 2.9.1
OpenGL: GeForce GTX 760/PCIe/SSE2 GL version 4.4.0, NVIDIA Corporation
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 (UK)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)

I guess I Fixed it, it was a mod thats called reptile mod