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I hope this is in the right place but i have no idea. So I got the report below, and looking for a solution i had deleted everything in my minecraft folder except i saved my "saves" folder and replaced it back in. I can load other worlds just fine but the one I really want to load doesnt load at all or will load to a blue world with black sillhouettes adn my inventory visible only. So what should i do now cause i really dont want to lose this world.

I dont think i have any mods or texture packs or anything like that. Originally I was playing and there was a giant chunk of my world gone but this time in darkness. So i tried to log out and relog in and all this business happened ':-(

---- Minecraft Crash Report ----
// Don't be sad, have a hug! <3

Time: 2/9/13 1:48 AM
Description: Exception in server tick loop

java.lang.NullPointerException
at cf.b(SourceFile:103)
at cf.a(SourceFile:35)
at iv.b(SourceFile:436)
at gm.a(SourceFile:72)
at bec.b(SourceFile:73)
at net.minecraft.server.MinecraftServer.r(SourceFile:762)
at net.minecraft.server.MinecraftServer.q(SourceFile:679)
at bdz.q(SourceFile:117)
at net.minecraft.server.MinecraftServer.run(SourceFile:613)
at fy.run(SourceFile:849)


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

-- System Details --
Details:
Minecraft Version: 1.4.7
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.6.0_15, Sun Microsystems Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
Memory: 429448736 bytes (409 MB) / 846528512 bytes (807 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 276616 (15490496 bytes; 14 MB) allocated, 276616 (15490496 bytes; 14 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
Profiler Position: N/A (disabled)
Vec3 Pool Size: 19837 (1110872 bytes; 1 MB) allocated, 19837 (1110872 bytes; 1 MB) used
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

ill just put this here
http://www.minecraftforum.net/topic/257477-world-recovery-thread-ill-fix-brokenmissing-worlds/

also what you could try to do is backup your players folder in your world save then delete the players inside of it see if that works. only thing ive come across before and doing that helped