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the pixelmon mod worked well for me then suddenly it didnt. i started my single player game, it loaded for a second and then it shows 'shutting down internal server'. can anyone help me? i have forge install. here is the report. pls help ;(

---- Minecraft Crash Report ----
// Oh - I know what I did wrong!

Time: 12/22/14 1:29 AM
Description: Ticking entity

java.lang.NullPointerException: Ticking entity
at com.pixelmonmod.pixelmon.entities.pixelmon.Entity5Rideable.func_70636_d(Entity5Rideable.java:339)
at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:1611)
at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:206)
at com.pixelmonmod.pixelmon.entities.pixelmon.Entity1Base.func_70071_h_(Entity1Base.java:179)
at com.pixelmonmod.pixelmon.entities.pixelmon.Entity2HasModel.func_70071_h_(Entity2HasModel.java:135)
at com.pixelmonmod.pixelmon.entities.pixelmon.Entity3HasStats.func_70071_h_(Entity3HasStats.java:330)
at com.pixelmonmod.pixelmon.entities.pixelmon.Entity4Textures.func_70071_h_(Entity4Textures.java:129)
at com.pixelmonmod.pixelmon.entities.pixelmon.Entity5Rideable.func_70071_h_(Entity5Rideable.java:382)
at com.pixelmonmod.pixelmon.entities.pixelmon.Entity8HoldsItems.func_70071_h_(Entity8HoldsItems.java:52)
at com.pixelmonmod.pixelmon.entities.pixelmon.Entity10CanBreed.func_70071_h_(Entity10CanBreed.java:75)
at com.pixelmonmod.pixelmon.entities.pixelmon.EntityPixelmon.func_70071_h_(EntityPixelmon.java:240)
at net.minecraft.world.World.func_72866_a(World.java:2070)
at net.minecraft.world.World.func_72870_g(World.java:2034)
at net.minecraft.world.World.func_72939_s(World.java:1887)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1995)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:962)
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:135)
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 com.pixelmonmod.pixelmon.entities.pixelmon.Entity5Rideable.func_70636_d(Entity5Rideable.java:339)
at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:1611)
at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:206)
at com.pixelmonmod.pixelmon.entities.pixelmon.Entity1Base.func_70071_h_(Entity1Base.java:179)
at com.pixelmonmod.pixelmon.entities.pixelmon.Entity2HasModel.func_70071_h_(Entity2HasModel.java:135)
at com.pixelmonmod.pixelmon.entities.pixelmon.Entity3HasStats.func_70071_h_(Entity3HasStats.java:330)
at com.pixelmonmod.pixelmon.entities.pixelmon.Entity4Textures.func_70071_h_(Entity4Textures.java:129)
at com.pixelmonmod.pixelmon.entities.pixelmon.Entity5Rideable.func_70071_h_(Entity5Rideable.java:382)
at com.pixelmonmod.pixelmon.entities.pixelmon.Entity8HoldsItems.func_70071_h_(Entity8HoldsItems.java:52)
at com.pixelmonmod.pixelmon.entities.pixelmon.Entity10CanBreed.func_70071_h_(Entity10CanBreed.java:75)
at com.pixelmonmod.pixelmon.entities.pixelmon.EntityPixelmon.func_70071_h_(EntityPixelmon.java:240)
at net.minecraft.world.World.func_72866_a(World.java:2070)
at net.minecraft.world.World.func_72870_g(World.java:2034)

-- Entity being ticked --
Details:
Entity Type: pixelmon.Pixelmon (com.pixelmonmod.pixelmon.entities.pixelmon.EntityPixelmon)
Entity ID: 47
Entity Name: entity.pixelmon.Pixelmon.name
Entity's Exact location: -1556.75, 80.00, 361.78
Entity's Block location: World: (-1557,80,361), Chunk: (at 11,5,9 in -98,22; contains blocks -1568,0,352 to -1553,255,367), Region: (-4,0; contains chunks -128,0 to -97,31, blocks -2048,0,0 to -1537,255,511)
Entity's Momentum: 0.00, -0.02, 0.00
Stacktrace:
at net.minecraft.world.World.func_72939_s(World.java:1887)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['guil2104'/45, l='MpServer', x=-1556.65, y=83.94, z=362.03]]
Chunk stats: MultiplayerChunkCache: 50, 50
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (184,64,265), Chunk: (at 8,4,9 in 11,16; contains blocks 176,0,256 to 191,255,271), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 437481 game time, 20629 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: 33 total; [EntityPixelmon['entity.pixelmon.Pixelmon.name'/128, l='MpServer', x=-1550.53, y=62.47, z=415.44], EntityPixelmon['entity.pixelmon.Pixelmon.name'/129, l='MpServer', x=-1547.56, y=62.53, z=414.47], EntityPixelmon['entity.pixelmon.Pixelmon.name'/130, l='MpServer', x=-1552.13, y=62.34, z=412.88], EntityPixelmon['entity.pixelmon.Pixelmon.name'/131, l='MpServer', x=-1552.44, y=62.06, z=415.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/68, l='MpServer', x=-1586.50, y=75.12, z=369.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/69, l='MpServer', x=-1587.53, y=84.60, z=367.43], EntityPixelmon['entity.pixelmon.Pixelmon.name'/70, l='MpServer', x=-1588.59, y=74.35, z=369.41], EntityPixelmon['entity.pixelmon.Pixelmon.name'/71, l='MpServer', x=-1591.45, y=82.60, z=367.51], EntityPixelmon['entity.pixelmon.Pixelmon.name'/72, l='MpServer', x=-1591.55, y=76.20, z=364.51], EntityPixelmon['entity.pixelmon.Pixelmon.name'/73, l='MpServer', x=-1581.23, y=73.19, z=372.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/74, l='MpServer', x=-1582.50, y=73.19, z=371.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/77, l='MpServer', x=-1518.50, y=86.00, z=341.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/90, l='MpServer', x=-1622.50, y=77.00, z=354.22], EntityPixelmon['entity.pixelmon.Pixelmon.name'/95, l='MpServer', x=-1547.50, y=70.02, z=390.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/96, l='MpServer', x=-1547.50, y=70.02, z=391.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/162, l='MpServer', x=-1615.50, y=19.50, z=362.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/163, l='MpServer', x=-1553.50, y=43.50, z=350.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/164, l='MpServer', x=-1552.50, y=43.50, z=351.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/105, l='MpServer', x=-1577.50, y=68.00, z=425.50], EntityClientPlayerMP['guil2104'/45, l='MpServer', x=-1556.65, y=83.94, z=362.03], EntityPixelmon['entity.pixelmon.Pixelmon.name'/47, l='MpServer', x=-1556.75, y=80.00, z=361.78], EntityTrainer['entity.pixelmon.Trainer.name'/48, l='MpServer', x=-1576.50, y=71.00, z=373.50], EntityTrainer['entity.pixelmon.Trainer.name'/49, l='MpServer', x=-1572.25, y=94.00, z=340.41], EntityTrainer['entity.pixelmon.Trainer.name'/50, l='MpServer', x=-1590.50, y=78.00, z=367.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/114, l='MpServer', x=-1562.50, y=72.12, z=387.50], EntityMinecartChest['entity.MinecartChest.name'/52, l='MpServer', x=-1509.50, y=21.50, z=313.50], EntityTrainer['entity.pixelmon.Trainer.name'/53, l='MpServer', x=-1636.69, y=64.00, z=367.44], EntityMinecartChest['entity.MinecartChest.name'/54, l='MpServer', x=-1493.50, y=20.50, z=318.50], EntityTrainer['entity.pixelmon.Trainer.name'/55, l='MpServer', x=-1486.38, y=68.16, z=407.16], EntityTrainer['entity.pixelmon.Trainer.name'/56, l='MpServer', x=-1464.50, y=67.00, z=384.50], EntityTrainer['entity.pixelmon.Trainer.name'/57, l='MpServer', x=-1484.50, y=68.00, z=419.84], EntityTrainer['entity.pixelmon.Trainer.name'/61, l='MpServer', x=-1470.50, y=73.00, z=430.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/127, l='MpServer', x=-1554.06, y=62.41, z=410.94]]
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:2433)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:908)
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:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 8 (x86) version 6.2
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 76885176 bytes (73 MB) / 523501568 bytes (499 MB) up to 523501568 bytes (499 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -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: 12, tallocated: 94
FML: MCP v9.05 FML v7.10.85.1272 Minecraft Forge 10.13.2.1272 4 mods loaded, 4 mods active
mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{7.10.85.1272} [Forge Mod Loader] (forge-1.7.10-10.13.2.1272.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{10.13.2.1272} [Minecraft Forge] (forge-1.7.10-10.13.2.1272.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
pixelmon{3.3.7} [Pixelmon] (Pixelmon-1.7.10-3.3.7-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Launched Version: 1.7.10-Forge10.13.2.1272
LWJGL: 2.9.1
OpenGL: GeForce GTX 770M/PCIe/SSE2 GL version 4.3.0, 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 (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)

An issue with pixelmon. You need to ask the author of the mod.