blknitemn

What is the easiest way to upgrade an existing 1.0.13 world to 1.1.4? I tried to move the world files into the upgraded server and get the following error message: 2013-04-17 10:46:16 [sEVERE] [ForgeModLoader] A TileEntity type universalelectri city.prefab.multiblock.TileEntityMulti has throw an exception trying to write st ate. It will not persist. Report this to the mod author java.lang.NullPointerException at universalelectricity.prefab.multiblock.TileEntityMulti.b(TileEntityMu lti.java:102) at aam.a(AnvilChunkLoader.java:311) at aam.a(AnvilChunkLoader.java:127) at im.b(ChunkProviderServer.java:232) at im.a(ChunkProviderServer.java:284) at in.a(WorldServer.java:844) at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:373) at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:605) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:497) at fy.run(SourceFile:849) Is there a way to clear this up? Will there be any issues with the upgraded world? Also this is a test world used from a backup of the original so if its hosed and I am stuck on the older version its not a big deal.

This may seem like a silly question, but how do I resolve and correct the IDs? Can you teach me how to fix this so I don't have to deal with this in the future? Obviously I am a little inexperienced with this level of issue and in the past have just nuked the server, but I really dont want to have to do this everytime.