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I tried to send a message on every server to try and check if it was the one server. It wasn't. Whenever I type and send a message, minecraft crashes! Here is the error report:

Some times in the chat, it will say "Cannot send chat message" but the error report:

---- Minecraft Crash Report ----
// Why is it breaking

Time: 8/1/13 11:21 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: 2 total; [bdf['Fringerguy'/386965, l='MpServer', x=961.48, y=91.62, z=439.40], bev['dragonace234'/386964, l='MpServer', x=1001.00, y=19.00, z=494.28]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (960,90,414), Chunk: (at 0,5,14 in 60,25; contains blocks 960,0,400 to 975,255,415), Region: (1,0; contains chunks 32,0 to 63,31, blocks 512,0,0 to 1023,255,511)
Level time: 37217172 game time, 41803738 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: true), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 21 total; [oc['entity.ItemFrame.name'/34, l='MpServer', x=969.50, y=91.50, z=447.06], oc['entity.ItemFrame.name'/35, l='MpServer', x=971.50, y=91.50, z=447.06], oc['entity.ItemFrame.name'/38, l='MpServer', x=966.06, y=91.50, z=451.50], oc['entity.ItemFrame.name'/39, l='MpServer', x=966.06, y=91.50, z=449.50], oc['entity.ItemFrame.name'/36, l='MpServer', x=974.50, y=91.50, z=447.06], bdf['Fringerguy'/386965, l='MpServer', x=961.48, y=91.62, z=439.40], oc['entity.ItemFrame.name'/37, l='MpServer', x=972.50, y=91.50, z=447.06], oc['entity.ItemFrame.name'/42, l='MpServer', x=970.50, y=91.50, z=452.94], oc['entity.ItemFrame.name'/43, l='MpServer', x=972.50, y=91.50, z=452.94], oc['entity.ItemFrame.name'/40, l='MpServer', x=969.50, y=91.50, z=452.94], oc['entity.ItemFrame.name'/41, l='MpServer', x=967.50, y=91.50, z=452.94], oc['entity.ItemFrame.name'/44, l='MpServer', x=977.50, y=90.50, z=447.06], oc['entity.ItemFrame.name'/45, l='MpServer', x=979.50, y=90.50, z=447.06], oc['entity.ItemFrame.name'/19, l='MpServer', x=953.06, y=90.50, z=441.50], oc['entity.ItemFrame.name'/21, l='MpServer', x=953.06, y=90.50, z=439.50], oc['entity.ItemFrame.name'/20, l='MpServer', x=953.06, y=90.50, z=440.50], oc['entity.ItemFrame.name'/23, l='MpServer', x=953.06, y=90.50, z=438.50], oc['entity.ItemFrame.name'/22, l='MpServer', x=953.06, y=90.50, z=436.50], bev['dragonace234'/386964, l='MpServer', x=1001.00, y=19.00, z=494.28], oc['entity.ItemFrame.name'/24, l='MpServer', x=953.06, y=90.50, z=437.50], bev['dragonace234'/386964, l='MpServer', x=1001.00, y=19.00, z=494.28]]
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: 2 total; [bdf['Fringerguy'/386965, l='MpServer', x=961.48, y=91.62, z=439.40], bev['dragonace234'/386964, l='MpServer', x=1001.00, y=19.00, z=494.28]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (960,90,414), Chunk: (at 0,5,14 in 60,25; contains blocks 960,0,400 to 975,255,415), Region: (1,0; contains chunks 32,0 to 63,31, blocks 512,0,0 to 1023,255,511)
Level time: 37217172 game time, 41803738 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: true), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 21 total; [oc['entity.ItemFrame.name'/34, l='MpServer', x=969.50, y=91.50, z=447.06], oc['entity.ItemFrame.name'/35, l='MpServer', x=971.50, y=91.50, z=447.06], oc['entity.ItemFrame.name'/38, l='MpServer', x=966.06, y=91.50, z=451.50], oc['entity.ItemFrame.name'/39, l='MpServer', x=966.06, y=91.50, z=449.50], oc['entity.ItemFrame.name'/36, l='MpServer', x=974.50, y=91.50, z=447.06], bdf['Fringerguy'/386965, l='MpServer', x=961.48, y=91.62, z=439.40], oc['entity.ItemFrame.name'/37, l='MpServer', x=972.50, y=91.50, z=447.06], oc['entity.ItemFrame.name'/42, l='MpServer', x=970.50, y=91.50, z=452.94], oc['entity.ItemFrame.name'/43, l='MpServer', x=972.50, y=91.50, z=452.94], oc['entity.ItemFrame.name'/40, l='MpServer', x=969.50, y=91.50, z=452.94], oc['entity.ItemFrame.name'/41, l='MpServer', x=967.50, y=91.50, z=452.94], oc['entity.ItemFrame.name'/44, l='MpServer', x=977.50, y=90.50, z=447.06], oc['entity.ItemFrame.name'/45, l='MpServer', x=979.50, y=90.50, z=447.06], oc['entity.ItemFrame.name'/19, l='MpServer', x=953.06, y=90.50, z=441.50], oc['entity.ItemFrame.name'/21, l='MpServer', x=953.06, y=90.50, z=439.50], oc['entity.ItemFrame.name'/20, l='MpServer', x=953.06, y=90.50, z=440.50], oc['entity.ItemFrame.name'/23, l='MpServer', x=953.06, y=90.50, z=438.50], oc['entity.ItemFrame.name'/22, l='MpServer', x=953.06, y=90.50, z=436.50], bev['dragonace234'/386964, l='MpServer', x=1001.00, y=19.00, z=494.28], oc['entity.ItemFrame.name'/24, l='MpServer', x=953.06, y=90.50, z=437.50], bev['dragonace234'/386964, l='MpServer', x=1001.00, y=19.00, z=494.28]]
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 (amd64) version 6.1
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 52198048 bytes (49 MB) / 232128512 bytes (221 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
AABB Pool Size: 9254 (518224 bytes; 0 MB) allocated, 18 (1008 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
Launched Version: 1.6.2-mcpatcher
LWJGL: 2.9.0
OpenGL: Intel(R) HD Graphics GL version 2.1.0 - Build 8.15.10.2119, Intel
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Resource Pack: Default
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 146 (8176 bytes; 0 MB) allocated, 20 (1120 bytes; 0 MB) used

From what I know of, no mods are installed. I just need some help! Please get back to me quickly!