Kaltura_Client_Exception thrown

Invalid KS "NDU4ZDQ1ZmQzYjg4NDMyNzdhYzkwNjdlMjY0Y2NjOWZhNjk4MDc1M3wxMDE7OzE0OTM0MjU0MzY7MjsxNDkzMzM5MDM2LjA1MzQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"