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I copied my world and this is what i saw. A crash report every time I try to join the world.

---- Minecraft Crash Report ----
// You should try our sister game, Minceraft!

Time: 11/4/14 9:00 PM
Description: Exception in server tick loop

java.lang.NoClassDefFoundError: net/minecraft/world/World$2
at net.minecraft.world.World.func_147460_e(World.java:714)
at net.minecraft.world.World.func_147459_d(World.java:650)
at net.minecraft.world.World.func_147444_c(World.java:613)
at net.minecraft.world.World.markAndNotifyBlock(World.java:488)
at net.minecraft.world.World.func_147465_d(World.java:466)
at net.minecraft.world.World.func_147449_b(World.java:600)
at net.minecraft.block.BlockDynamicLiquid.func_149674_a(SourceFile:83)
at net.minecraft.world.WorldServer.func_147454_a(WorldServer.java:432)
at net.minecraft.world.WorldServer.func_147464_a(WorldServer.java:409)
at net.minecraft.block.BlockDynamicLiquid.func_149726_b(SourceFile:225)
at net.minecraft.world.chunk.Chunk.func_150807_a(Chunk.java:655)
at net.minecraft.world.World.func_147465_d(World.java:451)
at net.minecraft.block.BlockDynamicLiquid.func_149813_h(SourceFile:117)
at net.minecraft.block.BlockDynamicLiquid.func_149674_a(SourceFile:90)
at net.minecraft.world.WorldServer.func_147454_a(WorldServer.java:432)
at net.minecraft.world.WorldServer.func_147464_a(WorldServer.java:409)
at net.minecraft.block.BlockDynamicLiquid.func_149726_b(SourceFile:225)
at net.minecraft.world.chunk.Chunk.func_150807_a(Chunk.java:655)
at net.minecraft.world.World.func_147465_d(World.java:451)
at net.minecraft.block.BlockDynamicLiquid.func_149813_h(SourceFile:117)
at net.minecraft.block.BlockDynamicLiquid.func_149674_a(SourceFile:90)
at net.minecraft.world.WorldServer.func_147454_a(WorldServer.java:432)
at net.minecraft.world.WorldServer.func_147464_a(WorldServer.java:409)
at net.minecraft.block.BlockDynamicLiquid.func_149726_b(SourceFile:225)
at net.minecraft.world.chunk.Chunk.func_150807_a(Chunk.java:655)
at net.minecraft.world.World.func_147465_d(World.java:451)
at net.minecraft.block.BlockDynamicLiquid.func_149813_h(SourceFile:117)
at net.minecraft.block.BlockDynamicLiquid.func_149674_a(SourceFile:92)
at net.minecraft.world.WorldServer.func_147454_a(WorldServer.java:432)
at net.minecraft.world.WorldServer.func_147464_a(WorldServer.java:409)
at net.minecraft.block.BlockDynamicLiquid.func_149726_b(SourceFile:225)
at net.minecraft.world.chunk.Chunk.func_150807_a(Chunk.java:655)
at net.minecraft.world.World.func_147465_d(World.java:451)
at net.minecraft.block.BlockDynamicLiquid.func_149813_h(SourceFile:117)
at net.minecraft.block.BlockDynamicLiquid.func_149674_a(SourceFile:104)
at net.minecraft.world.gen.feature.WorldGenLiquids.func_76484_a(SourceFile:39)
at net.minecraft.world.biome.BiomeDecorator.func_150513_a(BiomeDecorator.java:312)
at net.minecraft.world.biome.BiomeDecorator.func_150512_a(BiomeDecorator.java:105)
at net.minecraft.world.biome.BiomeGenBase.func_76728_a(BiomeGenBase.java:339)
at net.minecraft.world.biome.BiomeGenPlains.func_76728_a(BiomeGenPlains.java:96)
at net.minecraft.world.gen.ChunkProviderGenerate.func_73153_a(ChunkProviderGenerate.java:421)
at net.minecraft.world.gen.ChunkProviderServer.func_73153_a(ChunkProviderServer.java:279)
at net.minecraft.world.chunk.Chunk.func_76624_a(Chunk.java:1055)
at net.minecraft.world.gen.ChunkProviderServer.originalLoadChunk(ChunkProviderServer.java:190)
at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:131)
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:101)
at net.minecraft.server.MinecraftServer.func_71222_d(MinecraftServer.java:265)
at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:78)
at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:92)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:387)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows XP (x86) version 5.1
Java Version: 1.7.0_67, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 136683096 bytes (130 MB) / 253534208 bytes (241 MB) up to 523501568 bytes (499 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
FML: MCP v9.05 FML v7.10.85.1230 Minecraft Forge 10.13.2.1230 6 mods loaded, 6 mods active
mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
FML{7.10.85.1230} [Forge Mod Loader] (forge-1.7.10-10.13.2.1230.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Forge{10.13.2.1230} [Minecraft Forge] (forge-1.7.10-10.13.2.1230.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Backpack{2.0.1} [Backpack] (backpack-2.0.1-1.7.x.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
extvil{1.7.10-2.3b} [Extended_Villages] (extvil-1.7.10-2.3b.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
cfm{3.3.5} [§6MrCrayfish's Furniture Mod] (MrCrayfishFurnitureModv3.3.5(1.7.10).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'



Definitely Strange. Help.

I'm getting a similar error

https://www.dropbox.com/s/e2v9a8r32iunjz7/crash-2014-11-03_17.18.30-server.txt?dl=0