backup and restore : backup single module gives error

https://community.freepbx.org/t/call-for-contributors-include-dynamic-routes-in-backup-restore/82431/13

[root@freepbx ~]# fwconsole backup --backupsingle ivr --singlesaveto /var/spool/asterisk/backup
Transaction ID is: e4c718a9-7254-4692-9644-a14b3719ca19
Processing ivr
Working with ivr module
        Adding module manifest for ivr
***In single restores mode dependencies are NOT processed***
There was nothing to cleanup
Finished created backup file: /var/spool/asterisk/backup/ivr-20220609-132138-1654795298-15.0.29-1337915437.tar.gz
PHP Fatal error:  Call to undefined method FreePBX\modules\Backup\Handlers\Backup\Single::sendEmail() in /var/www/html/admin/modules/backup/Console/Backup.class.php on line 126
PHP Stack trace:
PHP   1. {main}() /var/lib/asterisk/bin/fwconsole:0
PHP   2. Symfony\Component\Console\Application->run() /var/lib/asterisk/bin/fwconsole:163
PHP   3. Symfony\Component\Console\Application->doRun() /var/www/html/admin/libraries/Composer/vendor/symfony/console/Application.php:148
PHP   4. Symfony\Component\Console\Application->doRunCommand() /var/www/html/admin/libraries/Composer/vendor/symfony/console/Application.php:255
PHP   5. Symfony\Component\Console\Command\Command->run() /var/www/html/admin/libraries/Composer/vendor/symfony/console/Application.php:960
PHP   6. FreePBX\Console\Command\Backup->execute() /var/www/html/admin/libraries/Composer/vendor/symfony/console/Command/Command.php:255
Whoops\Exception\ErrorException: Call to undefined method FreePBX\modules\Backup\Handlers\Backup\Single::sendEmail() in file /var/www/html/admin/modules/backup/Console/Backup.class.php on line 126
Stack trace:
  1. Whoops\Exception\ErrorException->() /var/www/html/admin/modules/backup/Console/Backup.class.php:126
  2. FreePBX\Console\Command\Backup->execute() /var/www/html/admin/libraries/Composer/vendor/symfony/console/Command/Command.php:255
  3. Symfony\Component\Console\Command\Command->run() /var/www/html/admin/libraries/Composer/vendor/symfony/console/Application.php:960
  4. Symfony\Component\Console\Application->doRunCommand() /var/www/html/admin/libraries/Composer/vendor/symfony/console/Application.php:255
  5. Symfony\Component\Console\Application->doRun() /var/www/html/admin/libraries/Composer/vendor/symfony/console/Application.php:148
  6. Symfony\Component\Console\Application->run() /var/lib/asterisk/bin/fwconsole:163
  7. {main}() /var/lib/asterisk/bin/fwconsole:0