renewing SSL cert - private key not found

renewing SSL cert - private key not found

I've been reading my notes from the past couple years (have used GUI the last couple of years).     I don't see what I'm doing wrong.   I generate CSR with matching data,  get a duplicate cert for my wildcard cert, when I got to Apply the cert I get "
The private key for the certificates you have uploaded is not found."

any ideas???

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