Ngh, Please fix this. When i always join a server, I crash!

---- Minecraft Crash Report ----
// I just don't know what went wrong

Time: 7/7/13 7:57 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 bcn.a(SourceFile:518)
at dl.a(SourceFile:49)
at cn.b(SourceFile:350)
at bcn.d(SourceFile:95)
at bcu.b(SourceFile:60)
at atn.k(SourceFile:1380)
at atn.S(SourceFile:662)
at atn.d(SourceFile:618)
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 bcn.a(SourceFile:518)
at dl.a(SourceFile:49)
at cn.b(SourceFile:350)
at bcn.d(SourceFile:95)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bcx['Creeper78123'/3951518, l='MpServer', x=1574.81, y=64.62, z=-2131.41]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-3590,60,-4136), Chunk: (at 10,3,8 in -225,-259; contains blocks -3600,0,-4144 to -3585,255,-4129), Region: (-8,-9; contains chunks -256,-288 to -225,-257, blocks -4096,0,-4608 to -3585,255,-4097)
Level time: 62736631 game time, 63561296 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: 19 total; [bcx['Creeper78123'/3951518, l='MpServer', x=1574.81, y=64.62, z=-2131.41], rl['Bat'/3955156, l='MpServer', x=1589.98, y=26.51, z=-2122.58], tc['Creeper'/3954855, l='MpServer', x=1605.50, y=37.00, z=-2087.50], rz['Squid'/3954862, l='MpServer', x=1576.05, y=62.44, z=-2154.13], rz['Squid'/3954863, l='MpServer', x=1585.31, y=48.97, z=-2164.09], tt['Zombie'/3954860, l='MpServer', x=1546.97, y=39.00, z=-2139.53], to['Skeleton'/3954861, l='MpServer', x=1538.50, y=34.00, z=-2146.50], tt['Zombie'/3954858, l='MpServer', x=1544.50, y=18.00, z=-2120.50], tt['Zombie'/3954859, l='MpServer', x=1540.50, y=18.00, z=-2131.50], tt['Zombie'/3954856, l='MpServer', x=1544.50, y=27.00, z=-2126.50], tt['Zombie'/3954857, l='MpServer', x=1543.50, y=18.00, z=-2126.50], tc['Creeper'/3954870, l='MpServer', x=1620.50, y=36.00, z=-2097.50], rl['Bat'/3954869, l='MpServer', x=1618.44, y=31.10, z=-2102.88], tc['Creeper'/3954867, l='MpServer', x=1617.50, y=30.00, z=-2103.41], sr['entity.MinecartChest.name'/3954866, l='MpServer', x=1616.50, y=31.34, z=-2123.50], rz['Squid'/3954864, l='MpServer', x=1595.35, y=58.80, z=-2156.64], sr['entity.MinecartChest.name'/3954879, l='MpServer', x=1630.50, y=24.50, z=-2174.50], tt['Zombie'/3954878, l='MpServer', x=1530.50, y=18.00, z=-2139.50], to['Skeleton'/3954872, l='MpServer', x=1619.50, y=28.00, z=-2088.50]]
Retry entities: 0 total; []
Stacktrace:
at bcu.a(SourceFile:284)
at atn.k(SourceFile:1387)
at atn.S(SourceFile:662)
at atn.d(SourceFile:618)
at net.minecraft.client.main.Main.main(SourceFile:101)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bcx['Creeper78123'/3951518, l='MpServer', x=1574.81, y=64.62, z=-2131.41]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-3590,60,-4136), Chunk: (at 10,3,8 in -225,-259; contains blocks -3600,0,-4144 to -3585,255,-4129), Region: (-8,-9; contains chunks -256,-288 to -225,-257, blocks -4096,0,-4608 to -3585,255,-4097)
Level time: 62736631 game time, 63561296 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: 19 total; [bcx['Creeper78123'/3951518, l='MpServer', x=1574.81, y=64.62, z=-2131.41], rl['Bat'/3955156, l='MpServer', x=1589.98, y=26.51, z=-2122.58], tc['Creeper'/3954855, l='MpServer', x=1605.50, y=37.00, z=-2087.50], rz['Squid'/3954862, l='MpServer', x=1576.05, y=62.44, z=-2154.13], rz['Squid'/3954863, l='MpServer', x=1585.31, y=48.97, z=-2164.09], tt['Zombie'/3954860, l='MpServer', x=1546.97, y=39.00, z=-2139.53], to['Skeleton'/3954861, l='MpServer', x=1538.50, y=34.00, z=-2146.50], tt['Zombie'/3954858, l='MpServer', x=1544.50, y=18.00, z=-2120.50], tt['Zombie'/3954859, l='MpServer', x=1540.50, y=18.00, z=-2131.50], tt['Zombie'/3954856, l='MpServer', x=1544.50, y=27.00, z=-2126.50], tt['Zombie'/3954857, l='MpServer', x=1543.50, y=18.00, z=-2126.50], tc['Creeper'/3954870, l='MpServer', x=1620.50, y=36.00, z=-2097.50], rl['Bat'/3954869, l='MpServer', x=1618.44, y=31.10, z=-2102.88], tc['Creeper'/3954867, l='MpServer', x=1617.50, y=30.00, z=-2103.41], sr['entity.MinecartChest.name'/3954866, l='MpServer', x=1616.50, y=31.34, z=-2123.50], rz['Squid'/3954864, l='MpServer', x=1595.35, y=58.80, z=-2156.64], sr['entity.MinecartChest.name'/3954879, l='MpServer', x=1630.50, y=24.50, z=-2174.50], tt['Zombie'/3954878, l='MpServer', x=1530.50, y=18.00, z=-2139.50], to['Skeleton'/3954872, l='MpServer', x=1619.50, y=28.00, z=-2088.50]]
Retry entities: 0 total; []

– System Details –
Details:
Minecraft Version: 1.6.1
Operating System: Windows XP (x86) version 5.1
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 34742480 bytes (33 MB) / 136765440 bytes (130 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 1 total; -Xmx1G
AABB Pool Size: 3136 (175616 bytes; 0 MB) allocated, 200 (11200 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
Launched Version: 1.6.1
LWJGL: 2.9.0
OpenGL: RADEON X300/X550 Series x86/SSE2 GL version 2.0.5695 WinXP Release, ATI Technologies Inc.
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: 1889 (105784 bytes; 0 MB) allocated, 290 (16240 bytes; 0 MB) used