Player is either on another team or not on any team. Cannot remove from team 'fly'.

Minecraft Crash Report ----
// Who set us up the TNT?

Time: 06/10/13 10:48
Description: Exception in world tick

java.lang.IllegalStateException: Player is either on another team or not on any team. Cannot remove from team 'fly'.
at atj.b(SourceFile:202)
at bcw.a(SourceFile:1164)
at fu.a(SourceFile:99)
at co.b(SourceFile:354)
at bcw.e(SourceFile:98)
at bdd.b(SourceFile:60)
at atv.k(SourceFile:1386)
at atv.S(SourceFile:663)
at atv.d(SourceFile:619)
at net.minecraft.client.main.Main.main(SourceFile:101)

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

– Head –
Stacktrace:
at atj.b(SourceFile:202)
at bcw.a(SourceFile:1164)
at fu.a(SourceFile:99)
at co.b(SourceFile:354)
at bcw.e(SourceFile:98)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bdi['danieljharris'/951765, l='MpServer', x=-10.65, y=127.62, z=-81.11]]
Chunk stats: MultiplayerChunkCache: 305
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (0,64,0), Chunk: (at 0,4,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 11040125 game time, 120000 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: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 18 total; [tr['Skeleton'/951819, l='MpServer', x=-80.50, y=93.00, z=-16.50], tf['Creeper'/951581, l='MpServer', x=-84.50, y=69.00, z=-15.50], tr['Skeleton'/951817, l='MpServer', x=-82.50, y=93.00, z=-13.50], tf['Creeper'/951582, l='MpServer', x=-84.03, y=69.00, z=-14.50], tw['Zombie'/948087, l='MpServer', x=-82.50, y=93.00, z=-16.50], tf['Creeper'/951711, l='MpServer', x=-84.50, y=93.00, z=-16.50], tr['Skeleton'/949343, l='MpServer', x=-77.06, y=82.00, z=-14.50], tf['Creeper'/948310, l='MpServer', x=-83.50, y=93.00, z=-13.50], tf['Creeper'/951254, l='MpServer', x=-83.50, y=93.00, z=-16.50], tr['Skeleton'/950774, l='MpServer', x=-83.50, y=94.00, z=-12.50], bdi['danieljharris'/951765, l='MpServer', x=-10.65, y=127.62, z=-81.11], tw['Zombie'/951477, l='MpServer', x=-79.63, y=93.00, z=-13.78], tr['Skeleton'/950037, l='MpServer', x=-80.50, y=94.00, z=-17.50], tw['Zombie'/941847, l='MpServer', x=-82.50, y=94.00, z=-17.50], tw['Zombie'/951478, l='MpServer', x=-80.50, y=94.00, z=-12.50], tw['Zombie'/949952, l='MpServer', x=-77.03, y=82.00, z=-15.50], tf['Creeper'/951830, l='MpServer', x=-88.50, y=82.00, z=-14.50], tr['Skeleton'/946333, l='MpServer', x=-79.50, y=93.00, z=-16.50]]
Retry entities: 0 total; []
Server brand: craftbukkit
Server type: Non-integrated multiplayer server
Stacktrace:
at bdd.a(SourceFile:284)
at atv.k(SourceFile:1393)
at atv.S(SourceFile:663)
at atv.d(SourceFile:619)
at net.minecraft.client.main.Main.main(SourceFile:101)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bdi['danieljharris'/951765, l='MpServer', x=-10.65, y=127.62, z=-81.11]]
Chunk stats: MultiplayerChunkCache: 305
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (0,64,0), Chunk: (at 0,4,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 11040125 game time, 120000 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: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 18 total; [tr['Skeleton'/951819, l='MpServer', x=-80.50, y=93.00, z=-16.50], tf['Creeper'/951581, l='MpServer', x=-84.50, y=69.00, z=-15.50], tr['Skeleton'/951817, l='MpServer', x=-82.50, y=93.00, z=-13.50], tf['Creeper'/951582, l='MpServer', x=-84.03, y=69.00, z=-14.50], tw['Zombie'/948087, l='MpServer', x=-82.50, y=93.00, z=-16.50], tf['Creeper'/951711, l='MpServer', x=-84.50, y=93.00, z=-16.50], tr['Skeleton'/949343, l='MpServer', x=-77.06, y=82.00, z=-14.50], tf['Creeper'/948310, l='MpServer', x=-83.50, y=93.00, z=-13.50], tf['Creeper'/951254, l='MpServer', x=-83.50, y=93.00, z=-16.50], tr['Skeleton'/950774, l='MpServer', x=-83.50, y=94.00, z=-12.50], bdi['danieljharris'/951765, l='MpServer', x=-10.65, y=127.62, z=-81.11], tw['Zombie'/951477, l='MpServer', x=-79.63, y=93.00, z=-13.78], tr['Skeleton'/950037, l='MpServer', x=-80.50, y=94.00, z=-17.50], tw['Zombie'/941847, l='MpServer', x=-82.50, y=94.00, z=-17.50], tw['Zombie'/951478, l='MpServer', x=-80.50, y=94.00, z=-12.50], tw['Zombie'/949952, l='MpServer', x=-77.03, y=82.00, z=-15.50], tf['Creeper'/951830, l='MpServer', x=-88.50, y=82.00, z=-14.50], tr['Skeleton'/946333, l='MpServer', x=-79.50, y=93.00, z=-16.50]]
Retry entities: 0 total; []
Server brand: craftbukkit
Server type: Non-integrated multiplayer server

– 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: 55754704 bytes (53 MB) / 123994112 bytes (118 MB) up to 4772200448 bytes (4551 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx5G
AABB Pool Size: 14099 (789544 bytes; 0 MB) allocated, 213 (11928 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
Launched Version: 1.6.4
LWJGL: 2.9.0
OpenGL: AMD Radeon HD 7730M GL version 4.2.11764 Compatibility Profile Context, ATI Technologies Inc.
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Pack: Default
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 95 (5320 bytes; 0 MB) allocated, 50 (2800 bytes; 0 MB) used