Comment 22 for bug 531010

This problem occurs when submitting a second time, after which the form dictionary contains the field.submission_data key. However, this key is not included in the FORM Map property defined in the launchpad_exchange plugin. Furthermore, this key is a file type which is not even available in the current set of properties.

To fix this bug, I created the new FileVariable class, the File property using that variable class and added the field.submission_data key to the FORM table. This should make it for Natty, thanks for the bug report.