Fatal error: Uncaught Error: Class 'ProtobufMessage' not found in /var/www/sites/for_new_app/Chat-API-master/src/libaxolotl-php/state/pb_proto_LocalStorageProtocol.php:11 Stack trace: #0 /var/www/sites/for_new_app/Chat-API-master/src/libaxolotl-php/IdentityKeyPair.php(3): require_once() #1 /var/www/sites/for_new_app/Chat-API-master/src/libaxolotl-php/state/IdentityKeyStore.php(4): require_once('/var/www/sites/...') #2 /var/www/sites/for_new_app/Chat-API-master/src/libaxolotl-php/state/AxolotlStore.php(3): require_once('/var/www/sites/...') #3 {main} thrown in /var/www/sites/for_new_app/Chat-API-master/src/libaxolotl-php/state/pb_proto_LocalStorageProtocol.php on line 11