Kaltura_Client_Exception thrown

Invalid KS "Njk4NzBlMTZkM2M3MGE2NDA4ZWY0ZWUzOWIwODczY2FkMDJlNWQ1N3wxMDE7OzE0OTA0MjMxMTA7MjsxNDkwMzM2NzEwLjI5OTk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"