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WHMCS\Exception\Application\InstallationVersionMisMatch: Database version '8.5.2-release.1' does not match file version '8.2.1-release.1' in C:\Backup\Webtech\vendor\whmcs\whmcs-foundation\lib\Application\ApplicationServiceProvider.php:0
Stack trace:
#0 C:\Backup\Webtech\init.php(0): WHMCS\Application\ApplicationServiceProvider::checkVersion()
#1 C:\Backup\Webtech\cart.php(0): unknown()
#2 {main}