Not getting delivered

The delivery boy is able to accept, pick up but not able to complete order.

Once swiped delivered option, it goes loading.

How to fix this?

Thank you
Sartaj Nadaf

SartajNadaf either disable invoice on email settings or make sure your SMTP/email settings are correctly set.

Getting the same error, smtp and email settings are correct.

paulfos send test email and verify if SMTP settings are correct.