Kaltura_Client_Exception thrown

Invalid KS "ZmVhZmQ3MDRmY2JhNmZhNjgxYzk4YmZhMWNkYWY0MzE2NDI0NWI0N3wxMDE7OzE0OTM0MjU3Njg7MjsxNDkzMzM5MzY4LjIwODk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"