If you've setup a staff listing page and when you preview it is shows a 500 server error see if one of the following solutions fixes the error:
- Correct staff unit ID is used in the correct subsitedata.xml file
- People are listed in the group in eStaffProfile
- Staff roles that people are assigned to are set to show on the web
- .htaccess file is published within your people (or similar) folder
- subsitedata.xml file is published