When i was on my server

I tried to talk by pressing t then enter a message
(it was supposed show up on the chat box)

it crashed
The game crashed no delay just quit to the counsel
here is the crash report
---- Minecraft Crash Report ----
// Oh - I know what I did wrong!

Time: 7/9/13 10:01 PM
Description: Deserializing Message

java.lang.ClassCastException: com.google.gson.JsonPrimitive cannot be cast to com.google.gson.JsonObject
at cw.a(SourceFile:14)
at cw.deserialize(SourceFile:10)
at com.google.gson.TreeTypeAdapter.read(TreeTypeAdapter.java:58)
at com.google.gson.Gson.fromJson(Gson.java:795)
at com.google.gson.Gson.fromJson(Gson.java:761)
at com.google.gson.Gson.fromJson(Gson.java:710)
at com.google.gson.Gson.fromJson(Gson.java:682)
at cu.c(SourceFile:220)
at bct.a(SourceFile:522)
at dl.a(SourceFile:49)
at cn.b(SourceFile:354)
at bct.e(SourceFile:98)
at bda.b(SourceFile:60)
at ats.k(SourceFile:1386)
at ats.S(SourceFile:663)
at ats.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 cw.a(SourceFile:14)
at cw.deserialize(SourceFile:10)
at com.google.gson.TreeTypeAdapter.read(TreeTypeAdapter.java:58)
at com.google.gson.Gson.fromJson(Gson.java:795)
at com.google.gson.Gson.fromJson(Gson.java:761)
at com.google.gson.Gson.fromJson(Gson.java:710)
at com.google.gson.Gson.fromJson(Gson.java:682)

– Serialized Message –
Details:
JSON string: Cannot send chat message.
Stacktrace:
at cu.c(SourceFile:220)
at bct.a(SourceFile:522)
at dl.a(SourceFile:49)
at cn.b(SourceFile:354)
at bct.e(SourceFile:98)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bdf['ferfer2000'/1578910, l='MpServer', x=2037.50, y=74.62, z=1709.50]]
Chunk stats: MultiplayerChunkCache: 81
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (2037,70,1634), Chunk: (at 5,4,2 in 127,102; contains blocks 2032,0,1632 to 2047,255,1647), Region: (3,3; contains chunks 96,96 to 127,127, blocks 1536,0,1536 to 2047,255,2047)
Level time: 108728143 game time, 109912573 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: 11 total; [bdf['ferfer2000'/1578910, l='MpServer', x=2037.50, y=74.62, z=1709.50], bev['deadlyninjagojay'/1568039, l='MpServer', x=2037.50, y=70.50, z=1636.41], rx['Pig'/876541, l='MpServer', x=2048.47, y=70.00, z=1742.44], tq['Skeleton'/1516877, l='MpServer', x=2036.50, y=50.00, z=1692.16], te['Creeper'/1572402, l='MpServer', x=2082.50, y=33.00, z=1663.50], tv['Zombie'/1517015, l='MpServer', x=2052.09, y=50.00, z=1728.50], te['Creeper'/1572403, l='MpServer', x=2077.50, y=33.00, z=1668.50], ry['Sheep'/969683, l='MpServer', x=2083.50, y=71.00, z=1688.19], ry['Sheep'/875350, l='MpServer', x=1997.81, y=63.00, z=1745.50], rq['Cow'/100068, l='MpServer', x=1990.91, y=69.00, z=1674.16], sb['Squid'/1527299, l='MpServer', x=2057.19, y=61.28, z=1755.16]]
Retry entities: 0 total; []
Server brand: ~_NULL~
Server type: Non-integrated multiplayer server
Stacktrace:
at bda.a(SourceFile:284)
at ats.k(SourceFile:1393)
at ats.S(SourceFile:663)
at ats.d(SourceFile:619)
at net.minecraft.client.main.Main.main(SourceFile:101)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bdf['ferfer2000'/1578910, l='MpServer', x=2037.50, y=74.62, z=1709.50]]
Chunk stats: MultiplayerChunkCache: 81
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (2037,70,1634), Chunk: (at 5,4,2 in 127,102; contains blocks 2032,0,1632 to 2047,255,1647), Region: (3,3; contains chunks 96,96 to 127,127, blocks 1536,0,1536 to 2047,255,2047)
Level time: 108728143 game time, 109912573 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: 11 total; [bdf['ferfer2000'/1578910, l='MpServer', x=2037.50, y=74.62, z=1709.50], bev['deadlyninjagojay'/1568039, l='MpServer', x=2037.50, y=70.50, z=1636.41], rx['Pig'/876541, l='MpServer', x=2048.47, y=70.00, z=1742.44], tq['Skeleton'/1516877, l='MpServer', x=2036.50, y=50.00, z=1692.16], te['Creeper'/1572402, l='MpServer', x=2082.50, y=33.00, z=1663.50], tv['Zombie'/1517015, l='MpServer', x=2052.09, y=50.00, z=1728.50], te['Creeper'/1572403, l='MpServer', x=2077.50, y=33.00, z=1668.50], ry['Sheep'/969683, l='MpServer', x=2083.50, y=71.00, z=1688.19], ry['Sheep'/875350, l='MpServer', x=1997.81, y=63.00, z=1745.50], rq['Cow'/100068, l='MpServer', x=1990.91, y=69.00, z=1674.16], sb['Squid'/1527299, l='MpServer', x=2057.19, y=61.28, z=1755.16]]
Retry entities: 0 total; []
Server brand: ~_NULL~
Server type: Non-integrated multiplayer server

– System Details –
Details:
Minecraft Version: 1.6.2
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_09, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
Memory: 47435624 bytes (45 MB) / 90226688 bytes (86 MB) up to 518979584 bytes (494 MB)
JVM Flags: 1 total; -Xmx512M
AABB Pool Size: 2832 (158592 bytes; 0 MB) allocated, 133 (7448 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
Launched Version: 1.6.2
LWJGL: 2.9.0
OpenGL: Intel(R) HD Graphics Family GL version 3.0.0 - Build 8.15.10.2342, Intel
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: 5328 (298368 bytes; 0 MB) allocated, 128 (7168 bytes; 0 MB) used