2012-03-05 08:56:40 [INFO] Starting minecraft server version 1.2.3
2012-03-05 08:56:40 [INFO] Loading properties
2012-03-05 08:56:40 [INFO] Starting Minecraft server on *:25565
2012-03-05 08:56:40 [INFO] Preparing level "world"
2012-03-05 08:56:40 [INFO] Converting map!
2012-03-05 08:56:41 [INFO] Converting... 2%
2012-03-05 08:56:42 [INFO] Converting... 5%
2012-03-05 08:56:43 [INFO] Converting... 7%
2012-03-05 08:56:44 [INFO] Converting... 9%
2012-03-05 08:56:45 [INFO] Converting... 11%
2012-03-05 08:56:46 [INFO] Converting... 16%
2012-03-05 08:56:46 [SEVERE] Unexpected exception
java.lang.ClassCastException: qx cannot be cast to nt
	at pf.g(SourceFile:113)
	at us.a(SourceFile:27)
	at ix.a(SourceFile:199)
	at ix.a(SourceFile:169)
	at ix.a(SourceFile:128)
	at net.minecraft.server.MinecraftServer.a(SourceFile:210)
	at net.minecraft.server.MinecraftServer.s(SourceFile:188)
	at net.minecraft.server.MinecraftServer.run(SourceFile:333)
	at dm.run(SourceFile:490)