Fatal error: Uncaught Error: Interface 'ECPrivateKey' not found in /var/www/sites/for_new_app/Chat-API-master/src/libaxolotl-php/ecc/DjbECPrivateKey.php:3 Stack trace: #0 {main} thrown in /var/www/sites/for_new_app/Chat-API-master/src/libaxolotl-php/ecc/DjbECPrivateKey.php on line 3