Kaltura_Client_Exception thrown

Invalid KS "ZTFlMmYzMmYwMjdjMmNiNmI0YzVkN2Y3NmI4YjljZDFhZmI4OTI5NXwxMDE7OzE0OTA0MjI4MTM7MjsxNDkwMzM2NDEzLjgzMDc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"