Kaltura_Client_Exception thrown

Invalid KS "N2YyN2JiYTFmZjczZDI0OWQ1NDM4NzBlNjMwMmJhMTgyN2NjNDg2NXwxMDE7OzE0NzUzNjEyODU7MjsxNDc1Mjc0ODg1Ljk0NDU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"