Cap deploy authentication failed for `'username'


I have a problem for executing : cap deploy

I already did some migration without any problem, but since few days
(after debian’s update) I can’t use cap deploy I have this message :

:~/ERP/Administration$ cap -v deploy
** transaction: start
*** [update_code] transaction: rollback
** [update_code] exception while rolling back:
Net::SSH::AuthenticationFailed, username
authentication failed for `username’

My password is ok
and normally I don’t use ssh : ssh_options[:paranoid] = false (in

I use capistrano 1.4.2

Does anybody have an idea ? how can i check the problem ??

Thanks in advance