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[NOT A BUG] cart blank page ValidateCheckout error


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We upgrade from the latest version 4X to version 5 of WHMCS since then no one can order from our website ....


The cart.php page is blank. If i enable display error i got :


Fatal error: Call to undefined function bundlesValidateCheckout() in /home/xxx/public_html/includes/orderfunctions.php on line 0


Anyone have this issue ?

Anyone know how to resolve this ?





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