If your website is running on a Windows operating system (i.e. using Windows hosting), then you’ll need to use the ZodiacPress Windows Server plugin.
ZP Windows Server overrides the default Swiss Ephemeris execution file with one that works on Windows.
ZP Windows Server is a free extension for ZodiacPress. Go to its main page to download it. It’s perfectly safe to install the plugin even if your site doesn’t use Windows hosting. The plugin will check for Windows hosting, and it will do nothing if your site is not hosted on Windows.
If you’re already using ZP Windows Server, and yet the birth report is still not working, then check the other ZodiacPress Troubleshooting documentation articles for other possible causes.