The game crashes when I try to speak in public chat

I expected It would send the message

It crashed my game

Type in public chat on my computer

Here is a copy of the error message i get
// On the bright side, I bought you a teddy bear!

Time: 7/8/13 9:02 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: 8 total; [bdf['Greygrey7'/66939, l='MpServer', x=0.50, y=72.62, z=-4.50], bev['natsuki_takaya'/66590, l='MpServer', x=0.41, y=70.16, z=-4.31], bev['Willeo11'/66144, l='MpServer', x=3.50, y=71.00, z=2.50], bev['bencraft737'/66832, l='MpServer', x=-4.50, y=78.00, z=-0.50], bev['xendrine107'/67075, l='MpServer', x=4.50, y=71.00, z=4.50], bev['Frankie_Fort'/67394, l='MpServer', x=1.50, y=74.00, z=-1.50], bev['HARY_POTTER'/67788, l='MpServer', x=-2.50, y=85.00, z=-4.50], bev['Hero_Shade_99'/68137, l='MpServer', x=0.50, y=73.00, z=-3.50]]
Chunk stats: MultiplayerChunkCache: 49
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (0,-1,0), Chunk: (at 0,-1,0 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: 10820 game time, 10820 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: 16 total; [bev['HARY_POTTER'/67788, l='MpServer', x=-2.50, y=85.00, z=-4.50], bdf['Greygrey7'/66939, l='MpServer', x=0.50, y=72.62, z=-4.50], bev['natsuki_takaya'/66590, l='MpServer', x=0.41, y=70.16, z=-4.31], bev['Willeo11'/66144, l='MpServer', x=3.50, y=71.00, z=2.50], bev['sinisterspy'/65887, l='MpServer', x=4.34, y=71.00, z=1.56], bev['bencraft737'/66832, l='MpServer', x=-4.50, y=78.00, z=-0.50], bev['xendrine107'/67075, l='MpServer', x=4.50, y=71.00, z=4.50], bev['natsuki_takaya'/66590, l='MpServer', x=0.41, y=70.16, z=-4.31], bev['Frankie_Fort'/67394, l='MpServer', x=1.50, y=74.00, z=-1.50], bev['HARY_POTTER'/67788, l='MpServer', x=-2.50, y=85.00, z=-4.50], bev['Hero_Shade_99'/68137, l='MpServer', x=0.50, y=73.00, z=-3.50], bev['Frankie_Fort'/67394, l='MpServer', x=1.50, y=74.00, z=-1.50], bev['Hero_Shade_99'/68137, l='MpServer', x=0.50, y=73.00, z=-3.50], bev['Willeo11'/66144, l='MpServer', x=3.50, y=71.00, z=2.50], bev['bencraft737'/66832, l='MpServer', x=-4.50, y=78.00, z=-0.50], bev['xendrine107'/67075, l='MpServer', x=4.50, y=71.00, z=4.50]]
Retry entities: 0 total; []
Server brand: craftbukkit
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: 8 total; [bdf['Greygrey7'/66939, l='MpServer', x=0.50, y=72.62, z=-4.50], bev['natsuki_takaya'/66590, l='MpServer', x=0.41, y=70.16, z=-4.31], bev['Willeo11'/66144, l='MpServer', x=3.50, y=71.00, z=2.50], bev['bencraft737'/66832, l='MpServer', x=-4.50, y=78.00, z=-0.50], bev['xendrine107'/67075, l='MpServer', x=4.50, y=71.00, z=4.50], bev['Frankie_Fort'/67394, l='MpServer', x=1.50, y=74.00, z=-1.50], bev['HARY_POTTER'/67788, l='MpServer', x=-2.50, y=85.00, z=-4.50], bev['Hero_Shade_99'/68137, l='MpServer', x=0.50, y=73.00, z=-3.50]]
Chunk stats: MultiplayerChunkCache: 49
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (0,-1,0), Chunk: (at 0,-1,0 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: 10820 game time, 10820 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: 16 total; [bev['HARY_POTTER'/67788, l='MpServer', x=-2.50, y=85.00, z=-4.50], bdf['Greygrey7'/66939, l='MpServer', x=0.50, y=72.62, z=-4.50], bev['natsuki_takaya'/66590, l='MpServer', x=0.41, y=70.16, z=-4.31], bev['Willeo11'/66144, l='MpServer', x=3.50, y=71.00, z=2.50], bev['sinisterspy'/65887, l='MpServer', x=4.34, y=71.00, z=1.56], bev['bencraft737'/66832, l='MpServer', x=-4.50, y=78.00, z=-0.50], bev['xendrine107'/67075, l='MpServer', x=4.50, y=71.00, z=4.50], bev['natsuki_takaya'/66590, l='MpServer', x=0.41, y=70.16, z=-4.31], bev['Frankie_Fort'/67394, l='MpServer', x=1.50, y=74.00, z=-1.50], bev['HARY_POTTER'/67788, l='MpServer', x=-2.50, y=85.00, z=-4.50], bev['Hero_Shade_99'/68137, l='MpServer', x=0.50, y=73.00, z=-3.50], bev['Frankie_Fort'/67394, l='MpServer', x=1.50, y=74.00, z=-1.50], bev['Hero_Shade_99'/68137, l='MpServer', x=0.50, y=73.00, z=-3.50], bev['Willeo11'/66144, l='MpServer', x=3.50, y=71.00, z=2.50], bev['bencraft737'/66832, l='MpServer', x=-4.50, y=78.00, z=-0.50], bev['xendrine107'/67075, l='MpServer', x=4.50, y=71.00, z=4.50]]
Retry entities: 0 total; []
Server brand: craftbukkit
Server type: Non-integrated multiplayer server

– System Details –
Details:
Minecraft Version: 1.6.2
Operating System: Mac OS X (x86_64) version 10.8.3
Java Version: 1.6.0_45, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 58165784 bytes (55 MB) / 101781504 bytes (97 MB) up to 1065025536 bytes (1015 MB)
JVM Flags: 1 total; -Xmx1G
AABB Pool Size: 18943 (1060808 bytes; 1 MB) allocated, 39 (2184 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: NVIDIA GeForce GT 640M OpenGL Engine GL version 2.1 NVIDIA-8.10.44 304.10.65f03, NVIDIA Corporation
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: 432 (24192 bytes; 0 MB) allocated, 23 (1288 bytes; 0 MB) used