Password is not accepted

Two or three days ago I installed an update for EmClient. Ever since I installed that update when EmClient starts it asks for a password to enter for my google account. When I enter the password it does not accept it. Fortunately although it does not accept it, my emails come in regularly for that account. I can still send and receive emails from that account. Why then EmClient asks for a password? [The problem occurred after I installed the update]