[Duplicity-talk] BackendException: No existing session

[eleanor]

Hi,

I'm running duplicity with the following command:

duplicity --name 'duply_user' --encrypt-key D8D1384D --sign-key
D8D1384D --verbosity '4' --ssh-askpass --exclude-globbing-filelist
'/home/user/.duply/user/exclude' '/home/user/'
'ssh://address@hidden/backup'


The ssh connection works, but duplicity gives me this error:

Import of duplicity.backends.dpbxbackend Failed: No module named dropbox
BackendException: ssh connection to address@hidden:22 failed: No existing 
session


Any ideas about this error, why does it happens. I'm using 0.6.22.