Non-Recommended Build 1499

So, I've been testing 1.0.0 (with build 1499) on a new world on my test server, and it seems to run fine.

However, I just attempted to load build 1499 on my main server, using the current world, and I got this:

Code:

02:16:17 [SEVERE] Unexpected exception
java.lang.NullPointerException
        at net.minecraft.server.WorldServer.c(WorldServer.java:162)
        at net.minecraft.server.World.addEntity(World.java:906)
        at net.minecraft.server.World.addEntity(World.java:858)
        at net.minecraft.server.WorldGenEnder.a(SourceFile:46)
        at net.minecraft.server.BiomeDecoratorSpikes.a(SourceFile:24)
        at net.minecraft.server.BiomeDecorator.a(SourceFile:28)
        at net.minecraft.server.BiomeBase.a(SourceFile:190)
        at net.minecraft.server.ChunkProviderSky.getChunkAt(SourceFile:336)
        at org.bukkit.craftbukkit.generator.NormalChunkGenerator.getChunkAt(NormalChunkGenerator.java:47)
        at net.minecraft.server.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:165)
        at net.minecraft.server.Chunk.a(Chunk.java:812)
        at net.minecraft.server.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:96)
        at net.minecraft.server.ChunkProviderServer.getOrCreateChunk(ChunkProviderServer.java:106)
        at net.minecraft.server.World.getChunkAt(World.java:331)
        at net.minecraft.server.World.getTypeId(World.java:278)
        at net.minecraft.server.World.isEmpty(World.java:282)
        at net.minecraft.server.World.a(World.java:249)
        at net.minecraft.server.WorldProviderSky.canSpawn(SourceFile:63)
        at net.minecraft.server.World.canSpawn(World.java:101)
        at net.minecraft.server.World.c(World.java:229)
        at net.minecraft.server.World.<init>(World.java:177)
        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:261)
        at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:161)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:388)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:457)
>STOP
02:17:40 [INFO] Stopping server
02:17:40 [INFO] Saving chunks

Am I to understand that there is no way to transfer a 1.8.1 world into 1.0.0?

Anyone else having this problem? I was having it on my test server, then somehow got it to start working, but now on my new server I am having the same problem again. Tried like every build up to 1499 and the only one that worked before (the very first one for 1.0.0) isn't working either now. Am I doing something wrong? Is there something I need to delete?

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

 

I have seen other forum threads about this problem, however I am not using this build, so I have not seen it for myself. I would recommend only getting the recommended builds instead of getting the newest 'successful' build.

 

We're using 1.8.1 maps in our 1.0.0 server with the same build number. No issues here so far.

 

I figured it out!

When migrating a world from 1.8.1 to 1.0.0, there's a difference in the directory order.

1.8.1 regions are in world/region/
1.0.0 regions are in world/DIM1/region/

Once I moved the files, no issues.