According to the bnsupport bundle, your currently active theme is
If you connect to the server through SSH and execute the following commands you should create a backup of the theme and delete it from the wordpress folder.
sudo mkdir ~/wordpress-backup-themes
sudo mv /opt/bitnami/apps/wordpress/htdocs/wp-content/themes/best-classifieds/ ~/wordpress-backup-themes/
Can you please share the output of the command to check if they worked fine?
In order to revert the change you can just execute this command:
sudo mv ~/wordpress-backup-themes/best-classifieds/ /opt/bitnami/apps/wordpress/htdocs/wp-content/themes/