ubiquity crashed with IndexError in child()

Binary package hint: ubiquity

I was performing install of gutsy Pre Release 6.9.7 and ubiquity crashed while i was trying to manually
partition the hard disk. Actually crashed on the very first step.
jt

ProblemType: Crash
Architecture: i386
Date: Sun Jun 10 21:36:50 2007
DistroRelease: Ubuntu 7.10
ExecutablePath: /usr/lib/ubiquity/bin/ubiquity
InterpreterPath: /usr/bin/python2.5
Package: ubiquity 1.5.2
PackageArchitecture: i386
ProcCmdline: /usr/bin/python /usr/lib/ubiquity/bin/ubiquity kde-ui
ProcCwd: /home/ubuntu
ProcEnviron:
 PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=en_US.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/lib/ubiquity/bin/ubiquity', 'kde-ui']
SourcePackage: ubiquity
Title: ubiquity crashed with IndexError in child()
Uname: Linux ubuntu 2.6.22-6-generic #1 SMP Fri Jun 1 19:24:12 GMT 2007 i686 GNU/Linux