Fwd: Trying to generate a RSA private key

[mary mary <maryryma4@xxxxxxxxx>]

Hello community,

A beginner here. 

I would need to extract a private key, PEM or RSA format, from a keystore file ("server.keystore") which I have. 
I've executed:

keytool -importkeystore -srcstorepass 123456 -srckeystore server.keystore -deststorepass 123456 -destkeystore server.p12 -deststoretype PKCS12

openssl pkcs12 -in server.p12 -passin pass:123456 -out server-key-temp.pem -nodes -nocerts

But i get an empty file: server-key-temp.pem is empty.

What's wrong?

Thank You.

Kind regards