Kaltura_Client_Exception thrown

Invalid KS "NmI4ZWZmNmY1M2QyZThlMjA3MDg4ODQ1ZDNkNjAyZGNkOTMwMDc2ZHwxMDE7OzE0ODExMTk3MzA7MjsxNDgxMDMzMzMwLjAwNTM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"