Problem with PSA CLI : PSA_PASSWD nor PSA_CRYPTED_PASSWD environment variables

[Angels]

After 8.1 to 8.2 upgrade (Debian etch machine) i ran:

/user/local/psa/bin/domain -u DOMAINNAME -hard_quota 10G

And got the following error:

usermng: neither PSA_PASSWD nor PSA_CRYPTED_PASSWD environment variables are set. unable to determine user's password

The hard_quota setting for the given domain was updated. What does this errormessage mean? Can it be ignored?