error will backup g-io-error-quark can't mount destination folder

Yesterday, I try to backup and I got and error about can't mounting the destination folder.
I have been using deja-dup 32.0 on ubuntu 15.04 without problems:

The backtrace says:
DUPLICITY: INFO 1
DUPLICITY: . Writing duplicity-full.20150717T062010Z.vol4122.difftar.gpg

DUPLICITY: DEBUG 1
DUPLICITY: . Backtrace of previous error: Traceback (innermost last):
DUPLICITY: . File "/usr/lib/python2.7/dist-packages/duplicity/backend.py", line 361, in inner_retr
y
DUPLICITY: . return fn(self, *args)
DUPLICITY: . File "/usr/lib/python2.7/dist-packages/duplicity/backend.py", line 511, in put
DUPLICITY: . self.__do_put(source_path, remote_filename)
DUPLICITY: . File "/usr/lib/python2.7/dist-packages/duplicity/backend.py", line 497, in __do_put
DUPLICITY: . self.backend._put(source_path, remote_filename)
DUPLICITY: . File "/usr/lib/python2.7/dist-packages/duplicity/backends/giobackend.py", line 138, in _put
DUPLICITY: . self.__copy_file(source_file, target_file)
DUPLICITY: . File "/usr/lib/python2.7/dist-packages/duplicity/backends/giobackend.py", line 117, in __copy_file
DUPLICITY: . None, self.__copy_progress, None)
DUPLICITY: . Error: g-io-error-quark: Zehaztutako kokalekua ez da muntatu (16)
DUPLICITY: .

DUPLICITY: ERROR 50 put '/home/zunbeltz/.cache/deja-dup/tmp/duplicity-k2Bo8E-tempdir/mktemp-pRxC8Y-3' 'duplicity-full.20150717T062010Z.vol4122.difftar.gpg'
DUPLICITY: . Giving up after 5 attempts. Error: g-io-error-quark: Zehaztutako kokalekua ez da muntatu (16)

The log shows the following destination argument for duplicity:
--gio sftp://<email address hidden>/data/users/xxx/backups-20140925
(server name is obsured, server name and user name are correct. I use sshfs to mount this path without problems.

Thanks in advance for your help,

Zunbletz