Kaltura_Client_Exception thrown

Invalid KS "N2ZhYmM3MDI4NTgyMmJlMDJmNDU4MTllYzFhMGI1MzQ4MjE5ZTNkMHwxMDE7OzE0ODc4NDg2NDM7MjsxNDg3NzYyMjQzLjg5MDU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"