WHMCS uses a MySQL® database to store all of your business data, including client and financial records.
For successful installation, updates, and operation, your system must meet the minimum system requirements for your WHMCS version.
Troubleshoot and resolve Argument 1 passed must be an instance of PDOStatement errors.
Troubleshoot and resolve Base table or view not found errors.
Troubleshoot and resolve Column 'group_id' cannot be null errors.
Troubleshoot and resolve MySQL Error Code 1142 - Command denied to user errors.
Troubleshoot and resolve Could not connect to database errors.