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Hello minecraft forum i 'm new in here.I have this problem can anyone help me to understand what is going on thanks.
That problem is after i have start the launcher and try run the map(new map)

Here the crash report:

--- BEGIN ERROR REPORT 4756ae4e --------
Full report at:
C:\Users\username\AppData\Roaming\.minecraft\crash-reports\crash-2013-11-24_17.02.57-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 24/11/2013 5:02 μμ

-- Head --
Stacktrace:
at mod_Timber.onTickInGame(mod_Timber.java:32)
at net.minecraft.src.BaseMod.doTickInGame(BaseMod.java:55)
at cpw.mods.fml.common.modloader.BaseModTicker.sendTick(BaseModTicker.java:102)
at cpw.mods.fml.common.modloader.BaseModTicker.tickBaseMod(BaseModTicker.java:78)
at cpw.mods.fml.common.modloader.BaseModTicker.tickEnd(BaseModTicker.java:56)
at cpw.mods.fml.common.SingleIntervalHandler.tickEnd(SingleIntervalHandler.java:34)
at cpw.mods.fml.common.FMLCommonHandler.tickEnd(FMLCommonHandler.java:141)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['User_2357'/471, l='MpServer', x=144,50, y=67,62, z=258,50]]
Chunk stats: MultiplayerChunkCache: 10
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (136,64,252), Chunk: (at 8,4,12 in 8,15; contains blocks 128,0,240 to 143,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 45 game time, 45 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: 11 total; [EntityWolf['Wolf'/292, l='MpServer', x=141,50, y=67,00, z=240,50], EntityCreeper['Creeper'/293, l='MpServer', x=128,63, y=26,00, z=271,78], EntityClientPlayerMP['User_2357'/471, l='MpServer', x=144,50, y=67,62, z=258,50], EntityWolf['Wolf'/337, l='MpServer', x=170,56, y=68,00, z=284,31], EntityWolf['Wolf'/336, l='MpServer', x=168,50, y=69,00, z=287,50], EntityWolf['Wolf'/313, l='MpServer', x=144,50, y=67,00, z=242,50], EntityWolf['Wolf'/334, l='MpServer', x=169,34, y=69,00, z=283,34], EntityWolf['Wolf'/335, l='MpServer', x=170,50, y=69,00, z=285,50], EntityCreeper['Creeper'/315, l='MpServer', x=155,50, y=29,00, z=285,50], EntitySkeleton['Skeleton'/314, l='MpServer', x=157,50, y=29,00, z=286,50], EntityBat['Bat'/333, l='MpServer', x=163,20, y=42,81, z=282,67]]
Retry entities: 0 total; []
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:441)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2414)
at net.minecraft.client.Minecraft.run(Minecraft.java:783)
at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
Minecraft Version: 1.5.2
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_21, Oracle Corporation
Java VM Version: Java HotSpot™ 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 1834891024 bytes (1749 MB) / 2009792512 bytes (1916 MB) up to 2009792512 bytes (1916 MB)
JVM Flags: 3 total; -Xms2000m -Xmx2000m -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump
AABB Pool Size: 94 (5264 bytes; 0 MB) allocated, 94 (5264 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
FML: MCP v7.51 FML v5.2.23.737 Minecraft Forge 7.8.1.737 Optifine OptiFine_1.5.2_HD_D5 5 mods loaded, 5 mods active
mcp{7.51} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{5.2.23.737} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{7.8.1.737} [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FlansMod{2.3.1} [Flan's Mod] (Flans-Mod-1.5.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_Timber{1.5.1} [Timber!] (Timber-Mod-1.5.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
LWJGL: 2.4.2
OpenGL: GeForce GTX 550 Ti/PCI/SSE2 GL version 4.1.0, NVIDIA Corporation
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: 179 (10024 bytes; 0 MB) allocated, 179 (10024 bytes; 0 MB) used

java.lang.NoSuchFieldError: g
at mod_Timber.onTickInGame(mod_Timber.java:32)
at net.minecraft.src.BaseMod.doTickInGame(BaseMod.java:55)
at cpw.mods.fml.common.modloader.BaseModTicker.sendTick(BaseModTicker.java:102)
at cpw.mods.fml.common.modloader.BaseModTicker.tickBaseMod(BaseModTicker.java:78)
at cpw.mods.fml.common.modloader.BaseModTicker.tickEnd(BaseModTicker.java:56)
at cpw.mods.fml.common.SingleIntervalHandler.tickEnd(SingleIntervalHandler.java:34)
at cpw.mods.fml.common.FMLCommonHandler.tickEnd(FMLCommonHandler.java:141)
at cpw.mods.fml.common.FMLCommonHandler.onRenderTickEnd(FMLCommonHandler.java:377)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:873)
at net.minecraft.client.Minecraft.run(Minecraft.java:760)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT f29d0437 ----------

Quote from zippyjack

I think this problem might be from the Mod's, but except that seems like there's nothing wrong.
I might be wrong!

okay man thanks i will search more about this mod then