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Everytime i play i randomly crash and this is what pops up, please help



---- Minecraft Crash Report ----
// There are four lights!

Time: 9/7/14 3:58 PM
Description: Unexpected error

java.lang.NullPointerException: Unexpected error
at net.minecraft.tileentity.TileEntity.func_145838_q(TileEntity.java:177)
at net.minecraft.client.renderer.RenderGlobal.getTileEntityBoundingBox(RenderGlobal.java:3340)
at net.minecraft.client.renderer.RenderGlobal.func_147589_a(RenderGlobal.java:744)
at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1728)
at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1298)
at net.minecraft.client.Minecraft.func_71411_J(MinecraftOverlay.java:980)
at net.minecraft.client.Minecraft.func_99999_d(MinecraftOverlay.java:869)
at net.minecraft.client.main.Main.main(SourceFile:103)
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.tileentity.TileEntity.func_145838_q(TileEntity.java:177)
at net.minecraft.client.renderer.RenderGlobal.getTileEntityBoundingBox(RenderGlobal.java:3340)
at net.minecraft.client.renderer.RenderGlobal.func_147589_a(RenderGlobal.java:744)
at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1728)

-- Affected level --
Details:
Level name: MpServer
All players: 3 total; [EntityClientPlayerMP['dragonflab1293'/1797725, l='MpServer', x=-263.70, y=84.71, z=172.30], EntityOtherPlayerMP['§5Michael Day'/1779470, l='MpServer', x=-252.00, y=69.00, z=181.25], EntityOtherPlayerMP['epickrocker'/1914882, l='MpServer', x=-292.43, y=87.06, z=151.78]]
Chunk stats: MultiplayerChunkCache: 75, 79
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (114,73,-2), Chunk: (at 2,4,14 in 7,-1; contains blocks 112,0,-16 to 127,255,-1), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Level time: 477900188 game time, 878726305 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: 106 total; [EntityDragon['§bFor awesome perks check out §6§l/BUY!'/1963388, l='MpServer', x=-263.00, y=-225.98, z=175.00], EntityOtherPlayerMP['epickrocker'/1914882, l='MpServer', x=-213.91, y=69.00, z=181.25], EntityOtherPlayerMP['§5Michael Day'/1779470, l='MpServer', x=-257.44, y=69.00, z=178.06], EntityOtherPlayerMP['MrGarrett777'/1900693, l='MpServer', x=-215.56, y=67.47, z=175.66], EntityOtherPlayerMP['Zompocalyps'/1401019, l='MpServer', x=-201.84, y=69.00, z=203.19], EntityHorse['§c§l-1.6'/1000081978, l='MpServer', x=-133.42, y=-1864.52, z=133.70], EntityOtherPlayerMP['epickrocker'/1914882, l='MpServer', x=-292.43, y=87.06, z=151.78], EntityHorse['§c§l-0.3'/1000084466, l='MpServer', x=-214.50, y=-1631.10, z=190.35], EntityHorse['§c§l-1.0'/1000084464, l='MpServer', x=-218.84, y=-1632.10, z=189.36], EntityPigZombie['§bCop'/1961638, l='MpServer', x=-262.50, y=69.00, z=161.16], EntityHorse['§c§l-0.7'/1000084450, l='MpServer', x=-216.90, y=-1632.29, z=180.07], EntityPigZombie['§bCop'/1961636, l='MpServer', x=-258.44, y=76.00, z=162.50], EntityHorse['§c§l-3.4'/1000084448, l='MpServer', x=-218.11, y=-1632.29, z=182.48], EntityPigZombie['§bCop'/1961637, l='MpServer', x=-263.69, y=70.02, z=160.31], EntityHorse['§c§l-0.3'/1000084454, l='MpServer', x=-212.35, y=-1631.10, z=186.13], EntityZombie['§cCrook'/1953510, l='MpServer', x=-294.94, y=77.98, z=156.67], EntityHorse['§c§l-0.9'/1000084452, l='MpServer', x=-213.32, y=-1631.10, z=188.97], EntityHorse['§c§l-2.8'/1000084458, l='MpServer', x=-212.42, y=-1631.10, z=189.78], EntityHorse['§c§l-3.1'/1000084456, l='MpServer', x=-216.94, y=-1631.10, z=185.61], EntityOtherPlayerMP['§5Michael Day'/1779470, l='MpServer', x=-256.66, y=69.00, z=178.94], EntityHorse['§c§l-1.8'/1000084462, l='MpServer', x=-216.52, y=-1631.10, z=185.34], EntityHorse['§c§l-2.5'/1000084460, l='MpServer', x=-217.98, y=-1631.10, z=189.29], EntityHorse['§c§l-20.0'/1000084436, l='MpServer', x=-216.49, y=-1631.10, z=184.40], EntityHorse['§c§l-17.2'/1000084438, l='MpServer', x=-212.81, y=-1632.29, z=177.61], EntityOtherPlayerMP['§5Michael Day'/1779470, l='MpServer', x=-256.94, y=69.00, z=181.63], EntityHorse['§c§l-14.5'/1000084440, l='MpServer', x=-219.39, y=-1632.29, z=180.86], EntityHorse['§c§l-11.8'/1000084442, l='MpServer', x=-218.15, y=-1632.29, z=180.89], EntityHorse['§c§l-8.9'/1000084444, l='MpServer', x=-217.12, y=-1632.29, z=179.32], EntityHorse['§c§l-6.2'/1000084446, l='MpServer', x=-213.41, y=-1632.29, z=179.95], EntityOtherPlayerMP['MrGarrett777'/1900693, l='MpServer', x=-179.09, y=71.00, z=184.59], EntityOtherPlayerMP['Zompocalyps'/1401019, l='MpServer', x=-222.50, y=69.00, z=188.50],

Hmm... try deleting the entire .minecraft folder in %appdata%. Make sure to have backups of the "saves" folder! (possibly resourcepack too)