Another console is connected to the server

Hi there,
This is the error that I have when I want to solve. I can’t pass this and it worked OK until now when I want to enter in the Management Console. Any ideas ? Why if I click the OK button the error appears again ?
Thank you !

BitDefender Management Console – Connecting to server…
Another console is connected to the server. Using several consoles connected at the same time can have unpredictable results.
OK
