Does sending the output to HTML work?
fCore::enableErrorHandling('html');
If not, check the display_errors
ini setting and make sure it is set to 1.
fCore::expose(ini_get('display_errors));
If you are getting output in the HTML, but not via email, then it sounds like your server might have an email configuration problem. You may need to check the mail logs on the server. Also, you can try using fSMTP with fCore, which allows for using an external mail server. See fCore#UsinganSMTPConnection for details.