Troubleshoot and resolve 1062 Duplicate entry for key tblconfiguration.PRIMARY errors.
Troubleshoot and resolve 1062 Duplicate entry for key tblinvoices.PRIMARY errors.
Error pages display friendly, styled messages about error conditions. All of WHMCS's error pages are fully customizable for your needs.
Troubleshoot and resolve main(): Failed opening required '/path/to/whmcs/..filename.php' errors.
Troubleshoot and resolve Oops! Access Denied - Forbidden errors while logging in to WHMCS.
Troubleshoot and resolve Oops! errors.
Troubleshoot and resolve an Oops Error: Module Not Found error.