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Blank Page while loading Invoice


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I've integrated WHMCS with my website. I just ordered a test order on my website.

When I try to view my invoice, I'm getting the following error.


Fatal error: Call to undefined function outputClientArea() in /home/mumhosti/public_html/my/login.php on line 0


I logged in to my WHMCS Admin area, Listed All Invoices, and then When I try opening the printable version of the invoice, I'm still getting the same error.


For Example, you can try out this page: https://my.mumhosting.com/viewinvoice.php?id=19


Can someone please help me on this. I'm not sure where to start from.




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  • WHMCS Support Manager

This isn't normal so I'd recommend a full re-upload of the PHP files (excluding configuration.php and the /install directory). If the problem persists please ensure you don't have any third party addons installed and open a support ticket.

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Hi Thanks for the reply mate.


Just before I do this, wanted to confirm whether this would reset all my saved settings like, products, services, admins, requests, clients, etc?


Thanks once again for your kind help.




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