Also this:
---- Minecraft Crash Report ----
// There are four lights!
Time: 3/16/14 4:17 PM
Description: Exception in server tick loop
java.lang.NullPointerException
at ajt.f(SourceFile:188)
at gu.m(SourceFile:690)
at net.minecraft.server.MinecraftServer.a(SourceFile:860)
at hz.a(SourceFile:274)
at ma.b(SourceFile:94)
at net.minecraft.server.MinecraftServer.q(SourceFile:425)
at net.minecraft.server.MinecraftServer.run(SourceFile:331)
at gp.run(SourceFile:573)
A detailed walkthrough of the error, its code path and all known details is as follows:
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-- System Details --
Details:
Minecraft Version: 1.5.2
Operating System: Mac OS X (x86_64) version 10.9.1
Java Version: 1.7.0_45, Oracle Corporation
Java VM Version: Java HotSpot 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 114700320 bytes (109 MB) / 163577856 bytes (156 MB) up to 1908932608 bytes (1820 MB)
JVM Flags: 0 total;
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 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: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Player Count: 0 / 20; []
Is Modded: Unknown (can't tell)
Type: Dedicated Server (map_server.txt)