Kaltura_Client_Exception thrown

Invalid KS "ZWI3MWMwZDQ1YTdlYTZlMjRlZmJkNTg1ZDFkMGI1ZjAwMTAwNGIyZHwxMDE7OzE0OTg2OTU3NzI7MjsxNDk4NjA5MzcyLjA5Mzk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"