Kaltura_Client_Exception thrown

Invalid KS "YjllMDA3MzM1NzA5NWQ3MDE0ZTg4NTM5OGU1MmZlMmIxNzhjMmVkNXwxMDE7OzE0NzUwNDc5NTA7MjsxNDc0OTYxNTUwLjg2Njk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"