Problem with CPSMAIL Access

Hello i installed CPS Mail Access with success.
But i got a problem when a user want to synchronise his mail box:

they got this message :
  Request URL
http://extranet-so.astek.fr/cps/portal_webmail/box_alopezrufian/background_synchronisation.html/background_synchronisation
Exception
Type AttributeError Exception Value 'NoneType' object has no attribute
'find'

Traceback (innermost last):

   - Module ZPublisher.Publish, line 113, in publish
   - Module ZPublisher.mapply, line 88, in mapply
   - Module ZPublisher.Publish, line 40, in call_object
   - Module Products.CPSMailAccess.mailbox, line 1497, in
   background_synchronisation
   - Module Products.CPSMailAccess.mailbox, line 356, in synchronize
   - Module Products.CPSMailAccess.mailbox, line 517, in _syncdirs
   - Module Products.CPSMailAccess.mailfolder, line 718, in
   _synchronizeFolder
   - Module Products.CPSMailAccess.imapconnection, line 441, in fetch
   - Module Products.CPSMailAccess.imapconnection, line 307, in
   _extractResult

AttributeError: 'NoneType' object has no attribute 'find'

After a lot of attempts they succed to read their mails, but this message is
not normal.

What we have to do to correct this bug?

Regards,

 Adrian

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