Kaltura_Client_Exception thrown

Invalid KS "NzA5ZmI1MWU4M2VhYWEwNjMyYzhmMTEzNmQyYjU3MjVlZmQ5MjZiYXwxMDE7OzE0ODgxMjYzNTI7MjsxNDg4MDM5OTUyLjU3MTI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"