What is error 530?

hello, my name is julie, i am new in the forum, but i have been using smartftp for many many months. recently i have encountered a problem. when i try to connect to my ftp i get an error that is 530 and says

Authentification failed, sorry
Cannot login waiting to retry (30s) . . .

please help me!

-Julie

Maybe the admin has changed your password? Or if you've already one connection open, you may not be allowed to open a second one ...

my friend knows the administrator, the administrator told him that he can't change his password either.

-Julie