Kaltura_Client_Exception thrown

Invalid KS "MWM3NzRhMmE0OWYxMTkwNmZlMmUyZjIxM2FhZDE0MWYyY2Y5MDIzZnwxMDE7OzE0OTgyODc1Mjk7MjsxNDk4MjAxMTI5Ljk1NDc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"