[Grml] BUG with grml2usb?

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I just wanted to install grml to USB using the following stick:

# fdisk -lu /dev/sdb

Disk /dev/sdb: 8011 MB, 8011087872 bytes
32 heads, 63 sectors/track, 7761 cylinders, total 15646656 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0x7d815235

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *          63    15646175     7823056+  83  Linux

After launching grml2usb, the following happens:

# grml2usb /home/daten/images/grml/grml_sid_20090404.iso /dev/sdb1
Using ISO /home/daten/images/grml/grml_sid_20090404.iso
Identified grml flavour "grml-daily-sid".
Copying files. This might take a while....
Note: grml flavour grml-daily-sid is being installed as the default booting system.
Installing default MBR
Traceback (most recent call last):
  File "/usr/sbin/grml2usb", line 1648, in <module>
    main()
  File "/usr/sbin/grml2usb", line 1640, in main
    handle_bootloader(device)
  File "/usr/sbin/grml2usb", line 1590, in handle_bootloader
    install_bootloader(device)
  File "/usr/sbin/grml2usb", line 654, in install_bootloader
    install_grub(device)
  File "/usr/sbin/grml2usb", line 606, in install_grub
    "--root-directory=%s" % device_mountpoint, device], stdout=file(os.devnull, "r+"))
  File "/usr/lib/python2.5/subprocess.py", line 594, in __init__
    errread, errwrite)
  File "/usr/lib/python2.5/subprocess.py", line 1153, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory

Does it have sth. to do that in the meantime I formatted the stick with ext2?

TIA
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