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When were in the server we all crash at the same time this is my crash report

---- Minecraft Crash Report ----
// Quite honestly, I wouldn't worry myself about that.

Time: 7/12/15 7:41 PM
Description: Unexpected error

java.lang.IllegalStateException: Player is either on another team or not on any team. Cannot remove from team 'NTE3'.
at bac.a(SourceFile:206)
at bjb.a(SourceFile:1168)
at id.a(SourceFile:100)
at id.a(SourceFile:12)
at ej.a(SourceFile:174)
at bje.e(SourceFile:212)
at bao.p(SourceFile:1306)
at bao.ak(SourceFile:774)
at bao.f(SourceFile:728)
at net.minecraft.client.main.Main.main(SourceFile:148)

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

-- Head --
Stacktrace:
at bac.a(SourceFile:206)
at bjb.a(SourceFile:1168)
at id.a(SourceFile:100)
at id.a(SourceFile:12)
at ej.a(SourceFile:174)
at bje.e(SourceFile:212)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [bjk['Legend4Hunter'/526044, l='MpServer', x=1472.27, y=158.62, z=3155.79]]
Chunk stats: MultiplayerChunkCache: 437, 437
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (854,83,1146), Chunk: (at 6,5,10 in 53,71; contains blocks 848,0,1136 to 863,255,1151), Region: (1,2; contains chunks 32,64 to 63,95, blocks 512,0,1024 to 1023,255,1535)
Level time: 482938 game time, 459765 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: 1 total; [bjk['Legend4Hunter'/526044, l='MpServer', x=1472.27, y=158.62, z=3155.79]]
Retry entities: 0 total; []
Server brand: CraftBukkit
Server type: Non-integrated multiplayer server
Stacktrace:
at bjf.a(SourceFile:289)
at bao.b(SourceFile:1972)
at bao.f(SourceFile:742)
at net.minecraft.client.main.Main.main(SourceFile:148)

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 180219864 bytes (171 MB) / 255066112 bytes (243 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -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: 13, tallocated: 95
Launched Version: 1.7.10
LWJGL: 2.9.1
OpenGL: GeForce GTX 760/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: 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: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)

Please Help Me

First I'm seeing:
Server brand: CraftBukkit

Update to Spigot 1.8.7, please.

If you need to have 1.7.10, tho, use this to compile 1.7.10 spigot:

java -jar <buildtools>.jar --rev 1.7.10