I am trying to install Ubuntu 11.10 in windows XP, Everything went as before until the countdown clock reached zero, then I got "Windows Backend object has no attribute 'iso-path' - see log for details. It's done it three times now. (Formatting in between)

The end of the log says

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11-01 17:20 DEBUG TaskList: New task check_iso
11-01 17:20 DEBUG TaskList: ### Running check_iso...
11-01 17:20 DEBUG CommonBackend: Checking Y:\ubuntu\install\installation.iso
11-01 17:20 DEBUG Distro: checking Ubuntu ISO Y:\ubuntu\install\installation.iso
11-01 17:20 DEBUG Distro: wrong size: 8094031872 > 900000000
11-01 17:20 DEBUG TaskList: ### Finished check_iso
11-01 17:20 ERROR TaskList: 'WindowsBackend' object has no attribute 'iso_path'
Traceback (most recent call last):
File "\lib\wubi\backends\common\tasklist.py", line 197, in __call__
File "\lib\wubi\backends\common\backend.py", line 579, in get_iso
File "\lib\wubi\backends\common\backend.py", line 565, in use_iso
AttributeError: 'WindowsBackend' object has no attribute 'iso_path'
11-01 17:20 DEBUG TaskList: # Cancelling tasklist
11-01 17:20 DEBUG TaskList: # Finished tasklist
11-01 17:20 ERROR root: 'WindowsBackend' object has no attribute 'iso_path'
Traceback (most recent call last):
File "\lib\wubi\application.py", line 58, in run
File "\lib\wubi\application.py", line 130, in select_task
File "\lib\wubi\application.py", line 205, in run_cd_menu
File "\lib\wubi\application.py", line 120, in select_task
File "\lib\wubi\application.py", line 158, in run_installer
File "\lib\wubi\backends\common\tasklist.py", line 197, in __call__
File "\lib\wubi\backends\common\backend.py", line 579, in get_iso
File "\lib\wubi\backends\common\backend.py", line 565, in use_iso
AttributeError: 'WindowsBackend' object has no attribute 'iso_path'