I'm trying to download my xml file using the worpdress tool > export but seem like i can't and prompt me a firerfox error saying

Firefox can't find the file at hxxp://domain.com/wp-admin/export.php?download=true&content=all&cat=0&post_au thor=0&post_start_date=0&post_end_date=0&post_stat us=0&page_author=0&page_start_date=0&page_end_date =0&page_status=0&submit=Download+Export+File.
what could be the wrong thing here?