Kaltura_Client_Exception thrown

Invalid KS "MDVlM2E1Mjg0NGMyZDc4ZjhiY2M3ZmY2OWIwOTE2NjYzZDExMTVlYXwxMDE7OzE0OTgyMjEyNDE7MjsxNDk4MTM0ODQxLjk0NzQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"