Firework Launcher Crash

---- Minecraft Crash Report ----
// This doesn't make any sense!

Time: 1/12/14 2:41 PM
Description: Reading NBT data

java.lang.ClassCastException: dn cannot be cast to dm
at dg.l(SourceFile:202)
at bky.h(SourceFile:86)
at blh.a(SourceFile:64)
at azi.p(SourceFile:1562)
at azi.ah(SourceFile:760)
at azi.f(SourceFile:711)
at net.minecraft.client.main.Main.main(SourceFile:152)


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

-- Head --
Stacktrace:
at dg.l(SourceFile:202)

-- Corrupt NBT tag --
Details:
Tag type found: INT
Tag type expected: INT[]
Tag name: Colors
Stacktrace:
at dg.l(SourceFile:202)
at bky.h(SourceFile:86)

-- Particle being ticked --
Details:
Particle: bky, Pos (1088.5,51.099999999999994,1046.5), RGBA (1.0,1.0,1.0,1.0), Age 0
Particle Type: MISC_TEXTURE
Stacktrace:
at blh.a(SourceFile:64)

-- Affected level --
Details:
Level name: MpServer
All players: 3 total; [bkf['ean521'/149, l='MpServer', x=1085.30, y=39.82, z=1038.06], bme['Captain_Cambo_87'/124, l='MpServer', x=999.36, y=36.75, z=1037.31], bme['SushiJ'/535, l='MpServer', x=1028.05, y=34.83, z=1042.14]]
Chunk stats: MultiplayerChunkCache: 441, 441
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (1105,4,1035), Chunk: (at 1,0,11 in 69,64; contains blocks 1104,0,1024 to 1119,255,1039), Region: (2,2; contains chunks 64,64 to 95,95, blocks 1024,0,1024 to 1535,255,1535)
Level time: 1429903 game time, 1400 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: true), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 42 total; [wj['entity.MinecartRideable.name'/478, l='MpServer', x=1009.50, y=37.50, z=1030.47], bkf['ean521'/149, l='MpServer', x=1085.30, y=39.82, z=1038.06], bme['SushiJ'/316, l='MpServer', x=1107.91, y=4.59, z=1065.78], xw['entity.FireworksRocketEntity.name'/546, l='MpServer', x=1088.50, y=49.34, z=1046.50], xw['entity.FireworksRocketEntity.name'/547, l='MpServer', x=1088.50, y=49.34, z=1046.50], xw['entity.FireworksRocketEntity.name'/544, l='MpServer', x=1088.50, y=49.34, z=1046.50], yg['entity.WitherSkull.name'/6, l='MpServer', x=1084.53, y=5.00, z=1047.50], xw['entity.FireworksRocketEntity.name'/545, l='MpServer', x=1088.50, y=49.34, z=1046.50], yg['entity.WitherSkull.name'/7, l='MpServer', x=1084.53, y=5.00, z=1047.50], bme['SushiJ'/487, l='MpServer', x=1061.00, y=43.22, z=1051.38], yg['entity.WitherSkull.name'/8, l='MpServer', x=1084.53, y=5.00, z=1047.50], yg['entity.WitherSkull.name'/10, l='MpServer', x=1124.50, y=24.97, z=1047.50], yg['entity.WitherSkull.name'/11, l='MpServer', x=1144.47, y=5.00, z=1047.50], yg['entity.WitherSkull.name'/12, l='MpServer', x=1144.47, y=5.00, z=1047.50], yg['entity.WitherSkull.name'/13, l='MpServer', x=1144.47, y=5.00, z=1047.50], yg['entity.WitherSkull.name'/14, l='MpServer', x=1144.47, y=5.00, z=1047.50], yg['entity.WitherSkull.name'/15, l='MpServer', x=1144.47, y=5.00, z=1047.50], yg['entity.WitherSkull.name'/17, l='MpServer', x=1144.47, y=5.00, z=1047.50], yg['entity.WitherSkull.name'/16, l='MpServer', x=1144.47, y=5.00, z=1047.50], yg['entity.WitherSkull.name'/19, l='MpServer', x=1144.47, y=5.00, z=1047.50], yg['entity.WitherSkull.name'/18, l='MpServer', x=1144.47, y=5.00, z=1047.50], bme['SushiJ'/415, l='MpServer', x=1032.78, y=33.78, z=1038.22], bme['SushiJ'/22, l='MpServer', x=1201.22, y=35.13, z=1052.13], yg['entity.WitherSkull.name'/20, l='MpServer', x=1144.47, y=5.00, z=1047.50], bme['Captain_Cambo_87'/124, l='MpServer', x=967.49, y=117.75, z=1035.67], bme['SushiJ'/535, l='MpServer', x=1028.05, y=34.83, z=1042.14], bme['SushiJ'/333, l='MpServer', x=1022.00, y=18.22, z=1027.56], wj['entity.MinecartRideable.name'/504, l='MpServer', x=1010.50, y=31.50, z=1025.50], bme['SushiJ'/229, l='MpServer', x=1120.16, y=1.00, z=1018.44], wb['item.tile.cloth.black'/526, l='MpServer', x=1083.94, y=30.13, z=1050.88], wj['entity.MinecartRideable.name'/503, l='MpServer', x=1010.50, y=31.50, z=1052.50], bme['SushiJ'/185, l='MpServer', x=996.44, y=4.03, z=1041.94], wb['item.tile.cloth.black'/522, l='MpServer', x=1090.06, y=10.13, z=1050.88], wb['item.tile.cloth.black'/523, l='MpServer', x=1094.16, y=4.13, z=1054.34], wb['item.tile.blockRedstone'/532, l='MpServer', x=1087.69, y=28.13, z=1022.09], bme['SushiJ'/535, l='MpServer', x=1028.05, y=34.83, z=1042.14], bme['Captain_Cambo_87'/124, l='MpServer', x=999.36, y=36.75, z=1037.31], wj['entity.MinecartRideable.name'/488, l='MpServer', x=1009.50, y=37.50, z=1047.47], wb['item.tile.cloth.black'/528, l='MpServer', x=1086.09, y=32.13, z=1048.34], wb['item.tile.blockRedstone'/531, l='MpServer', x=1086.44, y=30.13, z=1023.66], bme['Captain_Cambo_87'/124, l='MpServer', x=999.36, y=36.75, z=1037.31], bme['SushiJ'/430, l='MpServer', x=1010.59, y=37.50, z=1046.69]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Non-integrated multiplayer server
Stacktrace:
at bka.a(SourceFile:289)
at azi.b(SourceFile:1952)
at azi.f(SourceFile:720)
at net.minecraft.client.main.Main.main(SourceFile:152)

-- System Details --
Details:
Minecraft Version: 1.7.4
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.6.0_45, Sun Microsystems Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
Memory: 34855632 bytes (33 MB) / 152305664 bytes (145 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
AABB Pool Size: 4468 (250208 bytes; 0 MB) allocated, 4316 (241696 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.7.4
LWJGL: 2.9.1
OpenGL: Intel(R) HD Graphics 4000 GL version 4.0.0 - Build 10.18.10.3308, Intel
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: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 158 (8848 bytes; 0 MB) allocated, 106 (5936 bytes; 0 MB) used
Anisotropic Filtering: Off (1)

/summon FireworksRocketEntity 1088 48 1046 {LifeTime:10,FireworksItem:{id:401,Count:1,tag:{Fireworks:{Explosions:[{Flicker:1,Trail:1,Type:2,Colors:16711680},{Flicker:1,Trail:0,Colors:[9843760],FadeColors:[0]}]}}}}