Kaltura_Client_Exception thrown

Invalid KS "ZjQxY2NjM2M5ZGIzYTJlZTVlYjIxODA1NWFmMjQ4M2Q2ODE3MWU4MHwxMDE7OzE0NzUyNjI5ODE7MjsxNDc1MTc2NTgxLjU3ODU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"