syntax error validating uncompressed files

[pmiess]

the test file.
busybox-w32.zip

Downloading http://0install.net/2007/interfaces/FeedLint.xml
Downloading https://apps.0install.net/0install/feedlint.xml
Downloading https://apps.0install.net/python/python.xml
Downloading https://apps.0install.net/python/windows.xml
Downloading https://apps.0install.net/0install/0install-python.xml
Downloading https://apps.0install.net/python/pywin32.xml
Downloading https://apps.0install.net/utils/gnupg.xml
Downloading https://apps.0install.net/0install/0install-runenv-cli.xml
Traceback (most recent call last):
  File "C:\Users\x86Tester\AppData\Local\0install.net\implementations\sha256new_N5GGEFDYS6ZU6VJDJ2R7EZ5RHCHGCBSCPPIPWGYMZ3E335A4WYAQ\feedlint", line 355, in <module>
    check_source(feed_obj.url, source)
  File "C:\Users\x86Tester\AppData\Local\0install.net\implementations\sha256new_N5GGEFDYS6ZU6VJDJ2R7EZ5RHCHGCBSCPPIPWGYMZ3E335A4WYAQ\feedlint", line 215, in check_source
    check_source(feed_url, step)
  File "C:\Users\x86Tester\AppData\Local\0install.net\implementations\sha256new_N5GGEFDYS6ZU6VJDJ2R7EZ5RHCHGCBSCPPIPWGYMZ3E335A4WYAQ\feedlint", line 207, in check_source
    expected_size = source.size + (source.start_offset or 0)
AttributeError: 'FileSource' object has no attribute 'start_offset'

This was with stable V 0.10 but it also happens with 0.11
On Windows 7