Sorry for the issue with the config.php file when you install WHMCS. This error doesn't appear to be a common issue for WHMCS. You may need to speak with our live technical support team in order to resolve the issue. It is possible that the file has permissions issue and cannot be accessed. The tech support team will be able to resolve that issue. If you have any further questions or comments, please let us know.
Hello Atif,
Sorry for the issue with the config.php file when you install WHMCS. This error doesn't appear to be a common issue for WHMCS. You may need to speak with our live technical support team in order to resolve the issue. It is possible that the file has permissions issue and cannot be accessed. The tech support team will be able to resolve that issue. If you have any further questions or comments, please let us know.
Kindest regards,
Arnel C.