Import both contacts and customer

Hello,

I am trying to import contact details but getting error for only 1 filed record name customer name basically it is rename of accounts.

Have verified the filed name customer name on both contacts and customer entity, Customer name field is exist but unable to import.

PFA 

Please note user cannot do 2 jobs first importing contacts then import customer and it is become issue for primary contacts which need to map manually for all the records.

Regards

Faisal