Kaltura_Client_Exception thrown

Invalid KS "NGEzMmQwNjg5YmQxNTUyN2IxNDViODQyZTVhYWQ5MjczNTliZTkxNHwxMDE7OzE0OTYxMTAzMDU7MjsxNDk2MDIzOTA1LjQ1ODk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"