Error to "Download Full Mail"

[isakitohf]

When I press in "Download Full Mail" appears an error. The strange thing is that if I go to the tree list and return to the form, the email is successfully downloaded.

How I can fix this?

Thanks in advance

[sharoonthomas]

Can you paste the stack trace please ?

[isakitohf]

Now appears this message:

Last revision No. & ID :Bazaar Package not Found !<type 'exceptions.TypeError'>:cannot marshal None unless allow_none is enabled

And in the ubuntu's terminal appears this message:

WARNING: web-services:The method complete_mail of the object poweremail.mailbox can not return None !