If you selected WhatsApp as your channel of delivery and you are getting the warning above, this means that you are using an outdated version of WhatsApp.
This majorly happens to those clients using WhatsApp mods such as GBWhatsApp, YoWhatsApp, FMWhatsApp, etc. To overcome this error you will be required to update your version of WhatsApp. Otherwise, we recommend stock WhatsApp (original WhatsApp from PlayStore)
Submit a ticket and we’ll get back to you as soon as possible.