1.8 pre-release world cant work with bukkit?

my world was generated from the first 1.8 prerelease (the one a bit buggy) and when i try to switch to bukkit it launches fine for a bit then go 'unable to find spawn biome' then crash's with a bunch of code (ill post below) it can make its own world fine no problem, i even tried moving the 'new regions' in with the 'old region's and that did NOT work made it worse, i have backups so i went back, here is the code i get

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08:24:58 [INFO] Starting minecraft server version Beta 1.8.1
08:24:58 [INFO] Loading properties
08:24:58 [INFO] Starting Minecraft server on *:25565
08:24:58 [WARNING] **** SERVER IS RUNNING IN OFFLINE/INSECURE MODE!
08:24:58 [WARNING] The server will make no attempt to authenticate usernames. Be
ware.
08:24:58 [WARNING] While this makes the game possible to play without internet a
ccess, it also opens up the ability for hackers to connect with any username the
y choose.
08:24:58 [WARNING] To change this, set "online-mode" to "true" in the server.set
tings file.
08:24:58 [INFO] This server is running Craftbukkit version git-Bukkit-0.0.0-1067
-g6301507-b1185jnks (MC: 1.8.1)
08:24:58 [INFO] Preparing level "world"
08:24:58 [INFO] Default game type: 0
08:24:58 [INFO] ---- Migration of old nether folder required ----
08:24:58 [INFO] Unfortunately due to the way that Minecraft implemented multiwor
ld support in 1.6, Bukkit requires that you move your nether folder to a new loc
ation in order to operate correctly.
08:24:58 [INFO] We will move this folder for you, but it will mean that you need
to move it back should you wish to stop using Bukkit in the future.
08:24:58 [INFO] Attempting to move world\DIM-1 to world_nether\DIM-1...
08:24:58 [INFO] Success! To restore the nether in the future, simply move world_
nether\DIM-1 to world\DIM-1
08:24:58 [INFO] ---- Migration of old nether folder complete ----
08:24:58 [INFO] Unable to find spawn biome
08:24:58 [SEVERE] java.lang.NullPointerException
08:24:58 [SEVERE] at net.minecraft.server.WorldServer.c(WorldServer.java:1
06)
08:24:58 [SEVERE] at net.minecraft.server.World.a(World.java:2224)
08:24:58 [SEVERE] at net.minecraft.server.Chunk.addEntities(Chunk.java:629
)
08:24:58 [SEVERE] at net.minecraft.server.ChunkProviderServer.getChunkAt(C
hunkProviderServer.java:81)
08:24:58 [SEVERE] at net.minecraft.server.ChunkProviderServer.getOrCreateC
hunk(ChunkProviderServer.java:106)
08:24:58 [SEVERE] at net.minecraft.server.World.getChunkAt(World.java:300)

08:24:58 [SEVERE] at net.minecraft.server.World.getTypeId(World.java:247)
08:24:58 [SEVERE] at net.minecraft.server.World.isEmpty(World.java:251)
08:24:58 [SEVERE] at net.minecraft.server.World.a(World.java:218)
08:24:58 [SEVERE] at net.minecraft.server.WorldProviderHell.canSpawn(Sourc
eFile:37)
08:24:58 [SEVERE] at net.minecraft.server.World.canSpawn(World.java:104)
08:24:58 [SEVERE] at net.minecraft.server.World.c(World.java:202)
08:24:58 [SEVERE] at net.minecraft.server.World.<init>(World.java:150)
08:24:58 [SEVERE] at net.minecraft.server.WorldServer.<init>(WorldServer.j
ava:27)
08:24:58 [SEVERE] at net.minecraft.server.SecondaryWorldServer.<init>(Seco
ndaryWorldServer.java:8)
08:24:58 [SEVERE] at net.minecraft.server.MinecraftServer.a(MinecraftServe
r.java:221)
08:24:58 [SEVERE] at net.minecraft.server.MinecraftServer.init(MinecraftSe
rver.java:152)
08:24:58 [SEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftSer
ver.java:348)
08:24:58 [SEVERE] at net.minecraft.server.ThreadServerApplication.run(Sour
ceFile:417)
08:24:58 [SEVERE] Unexpected exception
java.lang.NullPointerException
at net.minecraft.server.WorldServer.c(WorldServer.java:106)
at net.minecraft.server.World.a(World.java:2224)
at net.minecraft.server.Chunk.addEntities(Chunk.java:629)
at net.minecraft.server.ChunkProviderServer.getChunkAt(ChunkProviderServ
er.java:81)
at net.minecraft.server.ChunkProviderServer.getOrCreateChunk(ChunkProvid
erServer.java:106)
at net.minecraft.server.World.getChunkAt(World.java:300)
at net.minecraft.server.World.getTypeId(World.java:247)
at net.minecraft.server.World.isEmpty(World.java:251)
at net.minecraft.server.World.a(World.java:218)
at net.minecraft.server.WorldProviderHell.canSpawn(SourceFile:37)
at net.minecraft.server.World.canSpawn(World.java:104)
at net.minecraft.server.World.c(World.java:202)
at net.minecraft.server.World.<init>(World.java:150)
at net.minecraft.server.WorldServer.<init>(WorldServer.java:27)
at net.minecraft.server.SecondaryWorldServer.<init>(SecondaryWorldServer
.java:8)
at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:221)
at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:152)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:348)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:417)
>



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any idea's?

anyone...?

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

BUMP! Been having the same issue and can't figure it out!

 

Me too. I just installed CraftBukkit and it dies every time it tries to load my 1.8.1 world (it's a post-release world) with the exact same posted error.

If I delete the world_nether folder (created after the crash), it generates a new nether world and everything seems fine after that. Unfortunately, ya know, I lose my nether world .

Deleting both world* folders and letting it generate a fresh world works fine too.