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Inserting Child records using Data loader

I have inserted Account records using data loader. and i am trying to Child records (Contact records) for this Account records using upsert in data loader.
But when i insert the child records i am getting the following error message.
"Foreign key external ID: 00100000006bpCE not found for field Production_Account_ID__c in entity Account"

Any advise on this issue?

Thank you!
If you directly go to the 00100000006bpCE record in your Salesforce org, could you see that record? I think we need to make sure that this Accound does exist in the org that you are accessing. 
The record does exist in the source org. Also in the destination org this value exists in the External Id field of the Account record that is migrated.