Server Upgrade

[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.