Need Help. Map Generation broken (presumed)

Code:

148 recipes
16 achievements
19:14:38 [INFO] Starting minecraft server version Beta 1.6.6
19:14:38 [INFO] Loading properties
19:14:38 [INFO] Starting Minecraft server on *:25565
19:14:38 [INFO] This server is running Craftbukkit version git-Bukkit-0.0.0-823-
gb9d0b04-b860jnks (MC: 1.6.6)
19:14:38 [INFO] Preparing level "world"
19:14:38 [SEVERE] java.lang.NullPointerException
19:14:38 [SEVERE]       at net.minecraft.server.ChunkProviderServer.getChunkAt(C
hunkProviderServer.java:185)
19:14:38 [SEVERE]       at net.minecraft.server.ChunkProviderServer.getChunkAt(C
hunkProviderServer.java:94)
19:14:38 [SEVERE]       at net.minecraft.server.ChunkProviderServer.getOrCreateC
hunk(ChunkProviderServer.java:117)
19:14:38 [SEVERE]       at net.minecraft.server.World.getChunkAt(World.java:252)

19:14:38 [SEVERE]       at net.minecraft.server.World.getTypeId(World.java:195)
19:14:38 [SEVERE]       at net.minecraft.server.World.isEmpty(World.java:199)
19:14:38 [SEVERE]       at net.minecraft.server.World.a(World.java:166)
19:14:38 [SEVERE]       at net.minecraft.server.WorldProvider.a(SourceFile:51)
19:14:38 [SEVERE]       at net.minecraft.server.World.canSpawn(World.java:158)
19:14:38 [SEVERE]       at net.minecraft.server.World.c(World.java:144)
19:14:38 [SEVERE]       at net.minecraft.server.World.<init>(World.java:109)
19:14:38 [SEVERE]       at net.minecraft.server.WorldServer.<init>(WorldServer.j
ava:29)
19:14:38 [SEVERE]       at net.minecraft.server.MinecraftServer.a(MinecraftServe
r.java:169)
19:14:38 [SEVERE]       at net.minecraft.server.MinecraftServer.init(MinecraftSe
rver.java:146)
19:14:38 [SEVERE]       at net.minecraft.server.MinecraftServer.run(MinecraftSer
ver.java:283)
19:14:38 [SEVERE]       at net.minecraft.server.ThreadServerApplication.run(Sour
ceFile:422)
19:14:38 [SEVERE] Unexpected exception
java.lang.NullPointerException
        at net.minecraft.server.ChunkProviderServer.getChunkAt(ChunkProviderServ
er.java:185)
        at net.minecraft.server.ChunkProviderServer.getChunkAt(ChunkProviderServ
er.java:94)
        at net.minecraft.server.ChunkProviderServer.getOrCreateChunk(ChunkProvid
erServer.java:117)
        at net.minecraft.server.World.getChunkAt(World.java:252)
        at net.minecraft.server.World.getTypeId(World.java:195)
        at net.minecraft.server.World.isEmpty(World.java:199)
        at net.minecraft.server.World.a(World.java:166)
        at net.minecraft.server.WorldProvider.a(SourceFile:51)
        at net.minecraft.server.World.canSpawn(World.java:158)
        at net.minecraft.server.World.c(World.java:144)
        at net.minecraft.server.World.<init>(World.java:109)
        at net.minecraft.server.WorldServer.<init>(WorldServer.java:29)
        at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:169)
        at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:146)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:283)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:422)
>stop
19:14:43 [INFO] Stopping the server..
19:14:43 [INFO] Stopping server
19:14:43 [SEVERE] java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
19:14:43 [SEVERE]       at java.util.ArrayList.RangeCheck(Unknown Source)
19:14:43 [SEVERE]       at java.util.ArrayList.get(Unknown Source)
19:14:43 [SEVERE]       at net.minecraft.server.MinecraftServer.stop(MinecraftSe
rver.java:269)
19:14:43 [SEVERE]       at net.minecraft.server.MinecraftServer.run(MinecraftSer
ver.java:339)
19:14:43 [SEVERE]       at net.minecraft.server.ThreadServerApplication.run(Sour
ceFile:422)
>Press any key to continue . . .

I get this problem when i try to make a new map.

What was happening before: My friend and I were playing around with VoxelSniper, and he made about a 30x30x15 block of tnt, possibly more. I tried to get out (expecting only the three that i placed to blow) by blowing a hole, also thinking he filled the area with smoothstone. The whole thing was freezing my computer, so i close it down, without using the 'stop' command. When I went on the server, the map was laggy as heck, so I decided to waste it. I get this error when it is trying to make a new map.