#36 AttributeError: 'NoneType' object has no attribute 'group'

Traceback (most recent call last):
File "/usr/bin/archivemail", line 1951, in <module>
main()
File "/usr/bin/archivemail", line 700, in main
archive(mailbox_path)
File "/usr/bin/archivemail", line 1121, in archive
_archive_imap(mailbox_name)
File "/usr/bin/archivemail", line 1373, in _archive_imap
msn, msg_size = m.group('msn'), int(m.group('size'))
AttributeError: 'NoneType' object has no attribute 'group'