Heroku No valid, non-passphrase-protected keys given error -

i have files:

addtrustexternalcaroot.crt star_mydomain_com.crt trustedsecurecertificateauthority5.crt usertrustrsaaddtrustca.crt domain.key 

domain.key passphrase protected , generated during creation of csr files (files required .crt files certificate provider. tried:

heroku certs:update certs/star_mydomain_com.crt certs/domain.key 

but following error:

 !    no valid, non-passphrase-protected keys given. 

how can generate valid crt/key heroku? (i tried other crt files domain key not valid domain certificates.

---

domain.key generated following command:

openssl genrsa -des3 -out domain.key 2048 

here's how remove passphrase private key:

openssl rsa -in certs/domain.key -out certs/domain-nopassphrase.key 

you'll need enter current passphrase on private key. if prompted passphrase on new key, not enter 1 (just press enter).

you can update ssl endpoint using cert + new key:

heroku certs:update certs/*.crt certs/domain-nopassphrase.key