Freepbx 13 restore failed

Hello, I tried to restore a backup and got this error:

Intialized!!
Intializing Restore…
Running pre-restore hooks, if any…
Restoring files (this may take some time)…
File restore complete!
Restoring Database…
Restored Database
Restoring astDB…
Restoring Settings complete
Running post-restore hooks, if any…
Cleaning up…
PHP Fatal error: Class ‘FreePBX\GPG’ not found in /var/www/html/admin/libraries/BMO/Self_Helper.class.php on line 189
Whoops\Exception\ErrorException: Class ‘FreePBX\GPG’ not found in file /var/www/html/admin/libraries/BMO/Self_Helper.class.php on line 189
Stack trace:

  1. () /var/www/html/admin/libraries/BMO/Self_Helper.class.php:189

any suggestions to fix?