Issue to refresh Satellites

Hello,

When I click refresh TLEs I get this PHP Fatal error:  Uncaught Error: Call to undefined function curl_init() in /var/www/html/Zenith/api/fetch_tle.php:14
Stack trace:
#0 {main}
  thrown in /var/www/html/Zenith/api/fetch_tle.php on line 14

Any idea what could be the issue ?

Thanks