Child record not found

Child record not found

Hi,

I am trying to migrate all Contacts, Accounts, Deals, Invoices, Invoice line item. I have create csv files for all the modules long with Product & Users. While migrating all the modules data I am getting success till Deal module but the moment migration process start migrating Invoices it is giving an error as "Client Record Not Found".  What does this mean, in the invoice file I have Contact ID, Account ID, Deal ID assigned against each invoices but still facing this error.

What will be the issue and how to rectify this?

I am attaching the screen shot of both the issues where all other modules got migrated and the Invoice error.
Error with Invoice
Correctly Migrated