Kaltura_Client_Exception thrown

Invalid KS "ZTBjMmI5MzM5YTZkZDMxMWRjNzhkMjIwMDYzZjMxMzM1ZGM4M2RkY3wxMDE7OzE0NzQ5NDIxNDg7MjsxNDc0ODU1NzQ4LjUwNzI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"