Troubleshoot and resolve The file is corrupted. errors.
Troubleshoot and resolve main(): Failed opening required '/path/to/whmcs/..filename.php' errors.
Troubleshoot and resolve The file cannot be decoded errors.
Troubleshoot and resolve File Not Found errors.
Troubleshoot and resolve Impossible to create the root directory errors.
Troubleshoot and resolve Fatal error: The file was encoded by... errors.
Troubleshoot and resolve Site error: the ionCube PHP Loader needs to be installed. errors.