You can enable error reporting in WHMCS from admin area and configuration file. For that you can login into WHMCS and follow below steps:
NOTE: You have to disable Display error immediately after trouble shooting otherwise it can be a security concern.
- Go to Configuration >> System Settings >> General Settings >> Other.
- Here you will find “Display Errors” checkbox, click on it.
- At last “Save Changes”.
NOTE: You have to disable Display error immediately after trouble shooting otherwise it can be a security concern.