Question on CSR and SSL

I again tried generating same.

CSR created

Associated private key 

site2testvip.crt (only cert is sent, private key is retained) is sent to CA for signing. Below command issued in powershell to sign the CSR.

command 1: openssl genrsa -out windowscakeypair.key 2048 -->used to generate key pair

command 2:openssl rsa -in windowscakeypair.key -pubout -out windowsca_public.key -->To extract public key

command 3:openssl x509 -in site2testvip.crt -out newsite2testvip.crt -req -signkey windowscakeypair.key -days 365 --->To Sign the Certificate

Unfortunately it is giving an error. Once it is signed, newly generated cert is installed in client browser for https communication.