NameError: global name 'isodir' is not defined

$ sudo ubuntu-vm-builder kvm hardy --iso ~/in/ubuntu/jeos-8.04.2-jeos-i386.iso --ssh-user-key=~/.ssh/id_dsa.pub --libvirt qemu:///system
2009-05-04 21:07:25,695 INFO Creating disk image: /tmp/vmbuildertD1994/disk0.img
2009-05-04 21:07:25,813 INFO Adding partition table to disk image: /tmp/vmbuildertD1994/disk0.img
2009-05-04 21:07:25,852 INFO Adding type 1 partition to disk image: /tmp/vmbuildertD1994/disk0.img
2009-05-04 21:07:25,892 INFO Adding type 3 partition to disk image: /tmp/vmbuildertD1994/disk0.img
2009-05-04 21:07:25,917 INFO Creating loop devices corresponding to the created partitions
2009-05-04 21:07:25,945 INFO Creating file systems
2009-05-04 21:07:26,018 INFO mke2fs 1.41.4 (27-Jan-2009)
2009-05-04 21:07:26,911 INFO Mounting target filesystems
2009-05-04 21:07:27,152 INFO Installing guest operating system. This might take some time...
2009-05-04 21:07:27,153 INFO Cleaning up
Traceback (most recent call last):
  File "/usr/bin/ubuntu-vm-builder", line 29, in <module>
    VMBuilder.run()
  File "/usr/lib/python2.6/dist-packages/VMBuilder/__init__.py", line 66, in run
    frontend.run()
  File "/usr/lib/python2.6/dist-packages/VMBuilder/plugins/cli/__init__.py", line 67, in run
    vm.create()
  File "/usr/lib/python2.6/dist-packages/VMBuilder/vm.py", line 457, in create
    self.install()
  File "/usr/lib/python2.6/dist-packages/VMBuilder/vm.py", line 396, in install
    self.distro.install(self.installdir)
  File "/usr/lib/python2.6/dist-packages/VMBuilder/plugins/ubuntu/distro.py", line 131, in install
    self.suite.install(destdir)
  File "/usr/lib/python2.6/dist-packages/VMBuilder/plugins/ubuntu/dapper.py", line 50, in install
    self.debootstrap()
  File "/usr/lib/python2.6/dist-packages/VMBuilder/plugins/ubuntu/dapper.py", line 206, in debootstrap
    cmd = ['/usr/sbin/debootstrap', '--arch=%s' % self.vm.arch, self.vm.suite, self.destdir, self.debootstrap_mirror()]
  File "/usr/lib/python2.6/dist-packages/VMBuilder/plugins/ubuntu/dapper.py", line 211, in debootstrap_mirror
    os.mkdir(isodir)
NameError: global name 'isodir' is not defined

ProblemType: Bug
Architecture: i386
DistroRelease: Ubuntu 9.04
Package: ubuntu-vm-builder 0.10-0ubuntu2
PackageArchitecture: all
ProcEnviron:
 LC_CTYPE=lt_LT.UTF-8
 PATH=(custom, user)
 LANG=lt_LT.UTF-8
 SHELL=/bin/bash
SourcePackage: vm-builder
Uname: Linux 2.6.28-11-generic i686