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Yesterday i didnt have this error and today i do. I dont know how to stop it, i havent made any system changes and im pretty much lost now. Any Ideas?

---- Minecraft Crash Report ----
// Uh... Did I do that?

Time: 12/5/12 6:15 PM
Description: Exception in server tick loop

java.lang.NullPointerException
at cf.b(SourceFile:103)
at cf.a(SourceFile:35)
at iv.b(SourceFile:437)
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(SourceFile:117)
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 Vista (x86) version 6.0
Java Version: 1.7.0_09, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 249346224 bytes (237 MB) / 799985664 bytes (762 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 384827 (21550312 bytes; 20 MB) allocated, 384827 (21550312 bytes; 20 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: 26317 (1473752 bytes; 1 MB) allocated, 26317 (1473752 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.