Crash when trying to tyme a message at multiplayer

Your version of Minecraft is no longer supported. We are currently only accepting issues from official release 1.6 and later. Please update your Minecraft launcher from the Official Site.

i have 1.6.2

i don't know why it says 1.4.7

Minecraft Crash Report ----
// You're mean.

Time: 13/9/2013 11:58 πμ
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['MrBloodyHacker'/1752760, l='MpServer', x=4329,50, y=50,62, z=-641,50]]
Chunk stats: MultiplayerChunkCache: 121
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (4329,49,-642), Chunk: (at 9,3,14 in 270,-41; contains blocks 4320,0,-656 to 4335,255,-641), Region: (8,-2; contains chunks 256,-64 to 287,-33, blocks 4096,0,-1024 to 4607,255,-513)
Level time: 283663652 game time, 283994063 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: 3 total; [bdf['MrBloodyHacker'/1752760, l='MpServer', x=4329,50, y=50,62, z=-641,50], oc['entity.ItemFrame.name'/800, l='MpServer', x=4331,50, y=48,50, z=-648,94], oc['entity.ItemFrame.name'/801, l='MpServer', x=4341,50, y=99,50, z=-637,94]]
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: 1 total; [bdf['MrBloodyHacker'/1752760, l='MpServer', x=4329,50, y=50,62, z=-641,50]]
Chunk stats: MultiplayerChunkCache: 121
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (4329,49,-642), Chunk: (at 9,3,14 in 270,-41; contains blocks 4320,0,-656 to 4335,255,-641), Region: (8,-2; contains chunks 256,-64 to 287,-33, blocks 4096,0,-1024 to 4607,255,-513)
Level time: 283663652 game time, 283994063 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: 3 total; [bdf['MrBloodyHacker'/1752760, l='MpServer', x=4329,50, y=50,62, z=-641,50], oc['entity.ItemFrame.name'/800, l='MpServer', x=4331,50, y=48,50, z=-648,94], oc['entity.ItemFrame.name'/801, l='MpServer', x=4341,50, y=99,50, z=-637,94]]
Retry entities: 0 total; []
Server brand: craftbukkit
Server type: Non-integrated multiplayer server

– System Details –
Details:
Minecraft Version: 1.6.2
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.8.0-ea, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 41292136 bytes (39 MB) / 101785600 bytes (97 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
AABB Pool Size: 21635 (1211560 bytes; 1 MB) allocated, 15 (840 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.6.2
LWJGL: 2.9.0
OpenGL: Intel(R) G41 Express Chipset GL version 2.1.0 - Build 8.15.10.2302, 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: 225 (12600 bytes; 0 MB) allocated, 16 (896 bytes; 0 MB) used

sorry clicked wrong report!