I will record what to do if the following error occurs in All In One WP Security.
Fatal error: Cannot declare class AIOS_Firewall_Resource_Unavailable, because the name is already in use in /home/abc/xyz.com/public_html/xyz.com/wp-content/plugins/all-in-one-wp-security-and-firewall/classes/wp-security-firewall-resource-unavailable.php on line 9
Delete the “All In One WP Security” Plugin Folder via FTP
Access the site experiencing errors through FTP and delete the following folder:/wp-content/plugins/all-in-one-wp-security-and-firewall.
Remove Unnecessary Files via FTP
Delete the following files and folders:
/aios-bootstrap.php/wp-content/mu-plugins/aios-firewall-loader.php/wp-content/uploads/aios
Reinstall the Plugin from the WordPress Admin Dashboard
Reinstall the “All In One WP Security” plugin via the WordPress admin dashboard.
After installation, double-check to ensure the settings remain intact.
Verify Login Functionality
Log out and log back in to confirm that the errors have been resolved.
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