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child record

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!
It means that there is no Account with id 00100000006bpCE  in your org