https://xoops.org/modules/smartfaq/faq.php?faqid=248
If this doesn't work, try to read these FAQ:
https://xoops.org/modules/smartfaq/category.php?categoryid=15&start=0
Another option would be to set the Debug on, and see what errors it produces. See more info about how to turn on debugging:
https://xoops.org/modules/smartfaq/faq.php?faqid=80