Php fatal error uncaught error class ithemesecurity extension

Hi @greensensation, thanks for reaching out, and we’re happy to help!

It seems you are experiencing the same issue found on this thread. Please confirm if the error message you’re seeing is this one:
Uncaught Error: Class "iThemesSecurity\Modules\Core\User_Query_Extension" not found in .../container.php:30 

If so, this usually happens when new files are not being copied over entirely during the update process, and to confirm whether this is the case, please check these files:
– check if the core/modules/core/User_Query_Extension.php file is missing from your installed Solid Security folder
– check if the vendor-prod/composer/autoload_classmap.php file is missing this line:
'iThemesSecurity\\Modules\\Core\\User_Query_Extension' => $baseDir . '/core/modules/core/User_Query_Extension.php',

If any of them are missing, we’d recommend manually installing a fresh copy of the plugin via FTP using these steps:

1. Using FTP/SFTP/Hosting File Manager, access your site’s files and go to /wp-content/plugins/.
2. Rename the Solid Security Basic folder to something like “_better-wp-security“.
3. Download the renamed plugin folder as a backup and delete the folder from your site’s files after downloading.
4. Download the latest version of Solid Security Basic here and unzip it.
5. Upload the latest Solid Security Basic plugin in the /wp-content/plugins/ directory.
6. Once done, you can go to your site’s WordPress Plugins page and activate Solid Security Basic.
7. Lastly, check if the issue persists.

Hope this helps, and let us know if it works!

@greensensation, understood! Please let us know how it goes.