Kaltura_Client_Exception thrown

Invalid KS "YzAzMzQzOTUyZTQzYTUxM2MxYzhlNjdiMzgxNDE5OTQyMDg4ZGY2MXwxMDE7OzE0OTMwMjc3ODY7MjsxNDkyOTQxMzg2LjAyNTtBbm9ueW1vdXM7ZWRpdDoq", Error "-1,INVALID_STR"