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hey everyone so i have a pixelmon and custom npc server, i made a custom npc and was scrolling through the models available and it showed a pixelmon mode when i was in the cloner i clicked to spawn it and it crashed client, everytime i join back in it crashes barely showing me spawn in this custom npc, i deleted custom npcs mod and tryed to join still same issue, so i deleted my player info so it took me back to spawn so i can now get in the server but whenever i go to the part of city where the custom npc is at it crashes my client or anyones client who goes within the some odd 80 block radius?? im trying to remove that custom npc so the town is accesable again but i do not know how to do this p.s. same thing happened before for me but on a single player client game, i couldnt fix it then either but sense this is my server i really want to get this fixed alot of time has been put into building this server, please let me know if you have any advise like on how to reset the npcs and it erases all the entitys? or something id appreciate it ill post the crash report below if it helps out at all!!!
thank you guys!!!!


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

Time: 2/13/14 3:36 AM
Description: Rendering Tile Entity

java.lang.NullPointerException
at net.minecraft.tileentity.MobSpawnerBaseLogic.func_98265_a(SourceFile:110)
at net.minecraft.tileentity.MobSpawnerBaseLogic.func_98281_h(SourceFile:234)
at net.minecraft.client.renderer.tileentity.TileEntityMobSpawnerRenderer.func_98144_a(SourceFile:22)
at net.minecraft.client.renderer.tileentity.TileEntityMobSpawnerRenderer.func_76905_a(SourceFile:17)
at net.minecraft.client.renderer.tileentity.TileEntityMobSpawnerRenderer.func_76894_a(SourceFile:12)
at net.minecraft.client.renderer.tileentity.TileEntityRenderer.func_76949_a(SourceFile:106)
at net.minecraft.client.renderer.tileentity.TileEntityRenderer.func_76950_a(SourceFile:98)
at net.minecraft.client.renderer.RenderGlobal.func_72713_a(RenderGlobal.java:536)
at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1160)
at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1006)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:946)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:838)
at net.minecraft.client.main.Main.main(SourceFile:101)
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:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)


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

-- Head --
Stacktrace:
at net.minecraft.tileentity.MobSpawnerBaseLogic.func_98265_a(SourceFile:110)
at net.minecraft.tileentity.MobSpawnerBaseLogic.func_98281_h(SourceFile:234)
at net.minecraft.client.renderer.tileentity.TileEntityMobSpawnerRenderer.func_98144_a(SourceFile:22)
at net.minecraft.client.renderer.tileentity.TileEntityMobSpawnerRenderer.func_76905_a(SourceFile:17)
at net.minecraft.client.renderer.tileentity.TileEntityMobSpawnerRenderer.func_76894_a(SourceFile:12)

-- Tile Entity Details --
Details:
Name: MobSpawner // net.minecraft.tileentity.TileEntityMobSpawner
Block type: ID #52 (tile.mobSpawner // net.minecraft.block.BlockMobSpawner)
Block data value: 0 / 0x0 / 0b0000
Block location: World: (13,63,455), Chunk: (at 13,3,7 in 0,28; contains blocks 0,0,448 to 15,255,463), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Actual block type: ID #52 (tile.mobSpawner // net.minecraft.block.BlockMobSpawner)
Actual block data value: 0 / 0x0 / 0b0000
Stacktrace:
at net.minecraft.client.renderer.tileentity.TileEntityRenderer.func_76949_a(SourceFile:106)
at net.minecraft.client.renderer.tileentity.TileEntityRenderer.func_76950_a(SourceFile:98)
at net.minecraft.client.renderer.RenderGlobal.func_72713_a(RenderGlobal.java:536)
at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1160)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['teddy_love_cake'/272, l='MpServer', x=19.94, y=72.75, z=518.37]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (34,63,461), Chunk: (at 2,3,13 in 2,28; contains blocks 32,0,448 to 47,255,463), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 10636080 game time, 11200538 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: 32 total; [EntityClientPlayerMP['teddy_love_cake'/272, l='MpServer', x=19.94, y=72.75, z=518.37], EntityPainting['Painting'/144, l='MpServer', x=16.94, y=65.00, z=548.00], EntityItemFrame['entity.ItemFrame.name'/129, l='MpServer', x=11.50, y=65.50, z=552.94], EntityItemFrame['entity.ItemFrame.name'/128, l='MpServer', x=6.50, y=64.50, z=552.94], EntityItemFrame['entity.ItemFrame.name'/131, l='MpServer', x=9.50, y=65.50, z=552.94], EntityItemFrame['entity.ItemFrame.name'/130, l='MpServer', x=10.50, y=65.50, z=552.94], EntityPainting['Painting'/122, l='MpServer', x=2.06, y=65.00, z=548.00], EntityItemFrame['entity.ItemFrame.name'/133, l='MpServer', x=7.50, y=65.50, z=552.94], EntityItemFrame['entity.ItemFrame.name'/132, l='MpServer', x=8.50, y=65.50, z=552.94], EntityPainting['Painting'/135, l='MpServer', x=12.06, y=65.00, z=546.00], EntityItemFrame['entity.ItemFrame.name'/134, l='MpServer', x=7.50, y=64.50, z=552.94], EntityPainting['Painting'/135, l='MpServer', x=12.06, y=65.00, z=546.00], EntityPainting['Painting'/144, l='MpServer', x=16.94, y=65.00, z=548.00], EntityPixelmon['Weedle'/145896, l='MpServer', x=45.50, y=67.00, z=518.50], EntityPixelmon['Nidoranmale'/145908, l='MpServer', x=56.50, y=64.00, z=488.50], EntityPixelmon['Ekans'/145975, l='MpServer', x=-6.97, y=68.00, z=567.72], EntityPainting['Painting'/122, l='MpServer', x=2.06, y=65.00, z=548.00], EntityPixelmon['Rattata'/146191, l='MpServer', x=53.50, y=63.00, z=478.50], EntityPixelmon['Rattata'/146190, l='MpServer', x=54.50, y=63.00, z=482.50], EntityPixelmon['Rattata'/146189, l='MpServer', x=49.50, y=63.00, z=482.50], EntityItemFrame['entity.ItemFrame.name'/119, l='MpServer', x=8.50, y=63.50, z=552.94], EntityItemFrame['entity.ItemFrame.name'/118, l='MpServer', x=9.50, y=63.50, z=552.94], EntityItemFrame['entity.ItemFrame.name'/117, l='MpServer', x=7.50, y=63.50, z=552.94], EntityItemFrame['entity.ItemFrame.name'/127, l='MpServer', x=8.50, y=64.50, z=552.94], EntityItemFrame['entity.ItemFrame.name'/126, l='MpServer', x=9.50, y=64.50, z=552.94], EntityItemFrame['entity.ItemFrame.name'/125, l='MpServer', x=10.50, y=64.50, z=552.94], EntityItemFrame['entity.ItemFrame.name'/124, l='MpServer', x=11.50, y=64.50, z=552.94], EntityItemFrame['entity.ItemFrame.name'/123, l='MpServer', x=12.50, y=64.50, z=552.94], EntityTrainer['entity.pixelmon.Trainer.name'/146049, l='MpServer', x=54.50, y=67.00, z=521.50], EntityPainting['Painting'/122, l='MpServer', x=2.06, y=65.00, z=548.00], EntityItemFrame['entity.ItemFrame.name'/121, l='MpServer', x=11.50, y=63.50, z=552.94], EntityItemFrame['entity.ItemFrame.name'/120, l='MpServer', x=10.50, y=63.50, z=552.94]]
Retry entities: 0 total; []
Server brand: mcpc,craftbukkit,fml,forge
Server type: Non-integrated multiplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:440)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2312)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:856)
at net.minecraft.client.main.Main.main(SourceFile:101)
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:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

-- System Details --
Details:
Minecraft Version: 1.6.4
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 158637464 bytes (151 MB) / 464191488 bytes (442 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
AABB Pool Size: 20397 (1142232 bytes; 1 MB) allocated, 173 (9688 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
FML: MCP v8.11 FML v6.4.31.935 Minecraft Forge 9.11.1.935 7 mods loaded, 7 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
FML{6.4.31.935} [Forge Mod Loader] (minecraftforge-9.11.1.935.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Forge{9.11.1.935} [Minecraft Forge] (minecraftforge-9.11.1.935.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
customnpcs{1.6.4} [CustomNpcs] (CustomNPCs_1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
pixelmon{2.5.7} [Pixelmon] (Pixelmon 2.5.7.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
pokeloot{1.6.1} [PokeLoot] (PokeLoot-1.6.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
LCSPM{1.0.6} [The Warp Mod] (TheWarpMod106_v1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Launched Version: 1.6.4-Forge9.11.1.935
LWJGL: 2.9.0
OpenGL: Intel(R) HD Graphics 4600 GL version 4.2.0 - Build 10.18.10.3316, Intel
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Pack: Pokeballers Pixelmon Texturepack 2.2.1.zip
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 3243 (181608 bytes; 0 MB) allocated, 92 (5152 bytes; 0 MB) used

Alright so the issue is you can't create pokemon spawners with the custom npc mod. It always does this. However, the pixelmon mod update that releases tonight is supposed to have spawners. The custom npc spawners DO work for pixelmon trainers if you copy them first.

Now on to fixing your problem.

You need to open your world up in mcedit find the spawner and delete it. Thats the only way to fix it.