I've got a mp world that some friends and I have spent an extreme amount of time building.   Had a kid related power failure on the pc.  When I got booted back up, the server will not load the world, I get the following error:
<code>
[INFO] Starting minecraft server version Beta 1.3
[INFO] Loading properties
[INFO] Starting Minecraft server on *:25565
[INFO] Preparing level "world"
[INFO] Preparing start region
[SEVERE] Unexpected exception
java.lang.NullPointerException
    at cv.b(SourceFile:72)
    at cp.a(SourceFile:1565)
    at gd.d(SourceFile:461)
    at fz.d(SourceFile:66)
    at fz.b(SourceFile:87)
    at cp.c(SourceFile:302)
    at cp.a(SourceFile:259)
    at cp.e(SourceFile:263)
    at cp.a(SourceFile:200)
    at mn.a(SourceFile:51)
    at cp.<init>(SourceFile:166)
    at cv.<init>(SourceFile:25)
    at net.minecraft.server.MinecraftServer.a(SourceFile:169)
    at net.minecraft.server.MinecraftServer.d(SourceFile:134)
    at net.minecraft.server.MinecraftServer.run(SourceFile:237)
    at bc.run(SourceFile:366)
</code>

Any suggestions for recovering?