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Oeps! Page when going to checkout

Devin Homan

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My clients get an error when trying to checkout using existing domain option with SiteLock & OX App Suite. Attached is the error page and stack trace.

Please assist!

WHMCS has been updated to V8

Recreation : Landing page for Site Lock/OX App Suite , when click buy now it give you 2 options, use existing domain or domain I already own which is also confusing? anyway when using the existing domain option and proceeding to check out the attached Oeps! page appears.

I have done no coding changes to WHMCS source files. Only changed the link of header logo.


Top of stack trace :

WHMCS\Exception\Domains\UniqueDomainRequired in /home/devneewx/my.devnetic.co.za/vendor/whmcs/whmcs-foundation/lib/Domains/Domain.php:0
Stack trace:
#0 /home/devneewx/my.devnetic.co.za/vendor/whmcs/whmcs-foundation/lib/MarketConnect/StoreController.php(0): WHMCS\Domains\Domain::isValidDomainName('palletsdiy', 'co.za')
#1 /home/devneewx/my.devnetic.co.za/vendor/whmcs/whmcs-foundation/lib/MarketConnect/StoreController.php(0): WHMCS\MarketConnect\StoreController->validateDomain('palletsdiy.co.z...')
#2 [internal function]: WHMCS\MarketConnect\StoreController->addToCart(Object(WHMCS\Http\Message\ServerRequest))

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  • WHMCS Support Manager

Hi @Devin Homan,

When an account holder wishes to order a MarketConnect service on their existing domain purchased through you, the intention is to select the Choose Existing Domain option.

The A domain I already own option is for domains registered elsewhere.


I've been able to reproduce the same behaviour in my v8.0.0 installation, so have opened case CORE-15412 with our development team to investigate.

Once we resolve cases and push features they are available at our change log, here:


I apologize for the inconvenience, and appreciate your patience as we work to resolve this.

Thanks again for taking the time to report your findings.

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