Guides & TutorialsTroubleshooting Common ErrorsTroubleshooting a Failed Opening Required file Error

Troubleshooting a Failed Opening Required file Error

Symptom

When accessing parts of WHMCS, you may see the following Oops error:

main(): Failed opening required '/path/to/whmcs/..filename.php'...
Oops! Failed opening required

Cause

A required file is missing (in this example, /whmcs/includes/orderfunctions.php).

Resolution

Upload the missing file to the folder path in the error message. We recommend re-uploading of all the WHMCS files to ensure that no other files are missing. Make certain that you successfully overwrite all of WHMCS's files.

The Full Release files can be downloaded from the WHMCS Downloads page.