Kaltura_Client_Exception thrown

Invalid KS "MDU5YjcwZGUzNWQ3MTI1MjAxM2IzMTFjODEzOWI4MTZlZTllZTA4N3wxMDE7OzE0NzUzNTQ0MDk7MjsxNDc1MjY4MDA5LjAxNDQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"