ID error when trying to post a new Order from Shopify via Zapier

ID error when trying to post a new Order from Shopify via Zapier

We're trying to set up a basic integration between Shopify and Zoho CRM so that when a new paid order comes in on our Shopify site, it posts a new Sals Order into our Zoho CRM account, using Zapier.

We've set up the field mapping, but when we try a test, we get the following error from Zoho:
  1. Unable to create entry in module: Invoices. Error : Invalid data for the field id. Detail : expected_data_type long, parent_api_name Contact_Name

Any ideas of what we can look at to resolve the issue?