Kaltura_Client_Exception thrown

Invalid KS "NmI0ODJjZWE1YTg4MWMwZDUwMTQ5NmEyMTE5OWI5OGMyZTg5MDRhMnwxMDE7OzE0ODUwOTIyMzA7MjsxNDg1MDA1ODMwLjI3NjQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"