I'm experiencing a file corruption error message. How do I correct this?

If an error message is displayed when visiting a WHMCS installation stating that a file is corrupted, it indicates that the file has been modified in some way. Below are some examples of such errors:

The file /path/to/whmcs/includes/clientfunctions.php is corrupted.

The file /path/to/whmcs/includes/invoicefunctions.php is corrupted.

The file /path/to/whmcs/includes/gatewayfunctions.php is corrupted.

The file /path/to/whmcs/includes/ticketfunctions.php is corrupted.

The file /path/to/whmcs/includes/TwoFactorAuthentication.php is corrupted.


The majority of the WHMCS PHP files are encoded using a system called Ioncube which hides the software's source code and prevents them from being modified directly. If these files are edited in any way, they cannot be decoded by your server back into the original PHP code, so are considerred corrupted and an error message displayed.

To resolve this file corruption error:
  1. Download a fresh copy of the WHMCS full release files from http://download.whmcs.com or from your licence reseller
  2. Extract the files(s) which are showing the corrupted error message.
  3. Upload file files to your server, overwriting the existing file.

Should the problem occurr again even after uploading a fresh copy of a file; compare the corrupted file on your server against the file downloaded from our website. Look for any differences between the files, then contact your server administrator or hosting provider to investigate why the file(s) were changed after being uploaded.
  • 768 Users Found This Useful
Was this answer helpful?

Related Articles

I'm seeing a blank or partially formatted page

Encountering a blank page or partially formatted page suggests that a fatal PHP error is...

What can I do as a developer myself to extend WHMCS?

WHMCS has a modular design which allows you to create your own modules to drop-in for additional...

I'm seeing a Down for Maintenance error when accessing my WHMCS admin area

Whilst the WHMCS software is being updated, a "Down for Maintenance" message is displayed This...

I would like to offer WHMCS to my customers, can I?

WHMCS offers both an affiliate referral program, and reseller program, where you are rewarded for...

I forgot the password to administrative area of my WHMCS installation? Can I reset it?

Should you forget your administrator password for WHMCS, you can request a password reset using...

Powered by WHMCompleteSolution