First, make sure that you double-check if the order really isn't there. If not, the details of the order then are probably wrong or the order was forgotten to put in the system. Let's verify the following questions to find out what could be wrong:
The order that should be in the system isn't created yet. Verify if the order was created and if it's correctly typed. We all can make human errors.
The name of the customer or the address of the customer is misspelled. Verify if there wasn't a mistake made.
If you made a mistake or the above problems aren't the issue, contact our chat support, so we can investigate the issue and help you solve it immediately.