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Im having a problem where only one of my Minecraft World wont load(my main world) and all the others work
The mods i use are Optifine and Rei's MiniMap(and ModLoader for the miniMap).I tried running it on a unmodified client but still it gives me this crash report



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

Time: 28.11.12. 10.56
Description: Exception in server tick loop

java.lang.NullPointerException
at cf.b(SourceFile:103)
at cf.a(SourceFile:35)
at iv.b(NetServerHandler.java:598)
at gm.a(SourceFile:72)
at bdr.b(SourceFile:73)
at net.minecraft.server.MinecraftServer.r(SourceFile:769)
at net.minecraft.server.MinecraftServer.q(SourceFile:686)
at bdo.q(IntegratedServer.java:124)
at net.minecraft.server.MinecraftServer.run(SourceFile:620)
at fy.run(SourceFile:856)


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

-- System Details --
Details:
Minecraft Version: 1.4.5
Operating System: Windows XP (x86) version 5.1
Java Version: 1.7.0_09, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
Memory: 277364008 bytes (264 MB) / 518979584 bytes (494 MB) up to 518979584 bytes (494 MB)
JVM Flags: 2 total; -Xms512m -Xmx512m
AABB Pool Size: 162125 (9079000 bytes; 8 MB) allocated, 162125 (9079000 bytes; 8 MB) used
Suspicious classes: IWrUpdater, Config, WrUpdates, ...[reifnsk.minimap.ReiMinimap, WaypointEntity, MinimapException, ...]
IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
ModLoader: Mods loaded: 2
ModLoader 1.4.5
mod_ReiMinimap v3.2_05 [1.4.5]

Profiler Position: N/A (disabled)
Vec3 Pool Size: 17442 (976752 bytes; 0 MB) allocated, 17442 (976752 bytes; 0 MB) used
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Very likely; Jar signature invalidated

Quote from webrosc

was the map normally generated or generated with mods that effect world gen (adding blocks etc)?

can you open the world with mcedit?

I didnt use any mods except optifine while generating it
And yes it can be opened in optifine
Ive played just fine on it for the last 3-4 weeks