Kaltura_Client_Exception thrown

Invalid KS "MDk0NjQzMzYwN2NjNWU0ODg0ODdiYThkYjEwZDY0YjM5YmE1MTAzNnwxMDE7OzE0ODc4NDg1MTI7MjsxNDg3NzYyMTEyLjMxNDc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"