Acronis True Image 2014 Errors Out with "Access to the file or folder is denied. (0x40014)"

I have Acronis TI 2014 on my pc with windows 7
I used it to backup some folders on a NAS
All works great until I added a new folder on the NAS and this new folder was added on the preexisting TI task.
I receive this error:
"
Impossibile accedere al file o alla cartella. (0x40014)
function = "WNetAddConnection3W",
filename = "\\192.168.0.2"
Tag = 0xF35F747B3B21FA6F
Errore durante l'accesso: nome utente sconosciuto o password non valida (0xFFF0)
code = 8007052E)
Tag = 0xBD28FDBD64EDB8C3
"
Probably it's an error to acces the new folder and I have to reset manually my authentication settings, but I don't Know how to do!

Sorry for my very bad english and THANKS for your support!