Troubleshooting: Uploading Line Items to Procore Failed

When I try to upload my line items to Procore, the upload fails saying "No line items could be mapped to a Procore cost code" how do I get around this?

This is happening because the Cost Codes for that Job haven't been set up in Procore yet by the Project Admin. 

You can read more about adding and setting up Cost Code here on the Procore site