Thanks for the reply, but I don't think it's the solution.
the mo problem is another, when I try to recover the password by clicking on "forgot username?" asks me to enter the email to reset the password ... immediately afterwards from this error that I described above.
in the 6.2 version that I used previously to work you had to enter the SMTP parameters etc .. on the config.php file, now in version 6.4, if I insert the parameters in the config.php file nothing happens ... where am I wrong ??
sorry for my translation