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i cant chat in single player it says cannot chat
in multiplayer I chat the thing crashes and I get this
---- Minecraft Crash Report ----
// Hi. I'm Minecraft, and I'm a crashaholic.
Time: 9/07/13 6:34 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: 3 total; [bdf['ausome159753'/2759957, l='MpServer', x=-36.24, y=7.62, z=12.94], bev['maxtoday'/826694, l='MpServer', x=-23.78, y=5.00, z=-5.63], bev['guitars2002'/2421884, l='MpServer', x=-69.22, y=43.00, z=1.81]]
Chunk stats: MultiplayerChunkCache: 121
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (0,5,0), Chunk: (at 0,0,0 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: 215987542 game time, 217595685 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: 21 total; [bdf['ausome159753'/2759957, l='MpServer', x=-36.24, y=7.62, z=12.94], bev['maxtoday'/826694, l='MpServer', x=-23.78, y=5.00, z=-5.63], oc['entity.ItemFrame.name'/38, l='MpServer', x=3.94, y=8.50, z=-7.50], oc['entity.ItemFrame.name'/39, l='MpServer', x=3.94, y=8.50, z=-5.50], oc['entity.ItemFrame.name'/36, l='MpServer', x=8.50, y=8.50, z=-2.94], oc['entity.ItemFrame.name'/37, l='MpServer', x=6.50, y=8.50, z=-2.94], oc['entity.ItemFrame.name'/42, l='MpServer', x=3.94, y=8.50, z=6.50], oc['entity.ItemFrame.name'/43, l='MpServer', x=3.94, y=8.50, z=8.50], oc['entity.ItemFrame.name'/40, l='MpServer', x=6.50, y=8.50, z=3.94], oc['entity.ItemFrame.name'/41, l='MpServer', x=8.50, y=8.50, z=3.94], bev['maxtoday'/826694, l='MpServer', x=-23.78, y=5.00, z=-5.63], bev['guitars2002'/2421884, l='MpServer', x=-69.22, y=43.00, z=1.81], oc['entity.ItemFrame.name'/23, l='MpServer', x=-5.50, y=8.50, z=3.94], oc['entity.ItemFrame.name'/25, l='MpServer', x=-2.94, y=8.50, z=8.50], oc['entity.ItemFrame.name'/24, l='MpServer', x=-7.50, y=8.50, z=3.94], oc['entity.ItemFrame.name'/27, l='MpServer', x=-2.94, y=7.50, z=7.50], oc['entity.ItemFrame.name'/26, l='MpServer', x=-2.94, y=8.50, z=6.50], oc['entity.ItemFrame.name'/29, l='MpServer', x=-2.94, y=6.50, z=7.50], oc['entity.ItemFrame.name'/28, l='MpServer', x=-2.94, y=6.50, z=8.50], bev['guitars2002'/2421884, l='MpServer', x=-69.22, y=43.00, z=1.81], oc['entity.ItemFrame.name'/30, l='MpServer', x=-2.94, y=6.50, z=6.50]]
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: 3 total; [bdf['ausome159753'/2759957, l='MpServer', x=-36.24, y=7.62, z=12.94], bev['maxtoday'/826694, l='MpServer', x=-23.78, y=5.00, z=-5.63], bev['guitars2002'/2421884, l='MpServer', x=-69.22, y=43.00, z=1.81]]
Chunk stats: MultiplayerChunkCache: 121
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (0,5,0), Chunk: (at 0,0,0 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: 215987542 game time, 217595685 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: 21 total; [bdf['ausome159753'/2759957, l='MpServer', x=-36.24, y=7.62, z=12.94], bev['maxtoday'/826694, l='MpServer', x=-23.78, y=5.00, z=-5.63], oc['entity.ItemFrame.name'/38, l='MpServer', x=3.94, y=8.50, z=-7.50], oc['entity.ItemFrame.name'/39, l='MpServer', x=3.94, y=8.50, z=-5.50], oc['entity.ItemFrame.name'/36, l='MpServer', x=8.50, y=8.50, z=-2.94], oc['entity.ItemFrame.name'/37, l='MpServer', x=6.50, y=8.50, z=-2.94], oc['entity.ItemFrame.name'/42, l='MpServer', x=3.94, y=8.50, z=6.50], oc['entity.ItemFrame.name'/43, l='MpServer', x=3.94, y=8.50, z=8.50], oc['entity.ItemFrame.name'/40, l='MpServer', x=6.50, y=8.50, z=3.94], oc['entity.ItemFrame.name'/41, l='MpServer', x=8.50, y=8.50, z=3.94], bev['maxtoday'/826694, l='MpServer', x=-23.78, y=5.00, z=-5.63], bev['guitars2002'/2421884, l='MpServer', x=-69.22, y=43.00, z=1.81], oc['entity.ItemFrame.name'/23, l='MpServer', x=-5.50, y=8.50, z=3.94], oc['entity.ItemFrame.name'/25, l='MpServer', x=-2.94, y=8.50, z=8.50], oc['entity.ItemFrame.name'/24, l='MpServer', x=-7.50, y=8.50, z=3.94], oc['entity.ItemFrame.name'/27, l='MpServer', x=-2.94, y=7.50, z=7.50], oc['entity.ItemFrame.name'/26, l='MpServer', x=-2.94, y=8.50, z=6.50], oc['entity.ItemFrame.name'/29, l='MpServer', x=-2.94, y=6.50, z=7.50], oc['entity.ItemFrame.name'/28, l='MpServer', x=-2.94, y=6.50, z=8.50], bev['guitars2002'/2421884, l='MpServer', x=-69.22, y=43.00, z=1.81], oc['entity.ItemFrame.name'/30, l='MpServer', x=-2.94, y=6.50, z=6.50]]
Retry entities: 0 total; []
Server brand: craftbukkit
Server type: Non-integrated multiplayer server
-- System Details --
Details:
Minecraft Version: 1.6.2
Operating System: Windows 8 (x86) version 6.2
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 33438536 bytes (31 MB) / 97370112 bytes (92 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 1 total; -Xmx1G
AABB Pool Size: 17184 (962304 bytes; 0 MB) allocated, 24 (1344 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: AMD Radeon HD 7800 Series GL version 4.2.12217 Compatibility Profile Context 12.104.0.0, ATI Technologies Inc.
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: 4645 (260120 bytes; 0 MB) allocated, 22 (1232 bytes; 0 MB) used