Guides & Tutorials7.1 Update TroubleshootingHow to resolve an HTTP 500 error after update

How to resolve an HTTP 500 error after update

A blank page or HTTP 500 Internal Server error after updating indicates that a PHP fatal error is occurring.

This can be caused by an incompatible module/customisation, missing or corrupted file, or server incompatibility with the new version.

To diagnose the exact cause, error display needs to be enabled.

Enabling Error Display

If you can access the admin area, login and navigate to Setup > General Settings.

Select the Other tab, scroll to the bottom of the page, and check the Display Errors box. Then hit Save.

Now re-perform the steps you previously took to generate a blank page. This time instead of a blank page you should see an error message indicating what is causing the issue

Enabling Error Display when the admin area is inaccessible

When the admin area cannot be accessed, you can enable error display by editing the configuration.php file located in the WHMCS root directory.

To do this, open the configuration.php file and add the following line as shown below:

Now re-perform the steps you previously took to generate a blank page. This time instead of a blank page you should see an error message indicating what is causing the issue