Explanation
You are attempting to install a certificate file using
'chsystemcert -install' without first creating a certificate request.
Only a signed certificate that is produced from a certificate request
that is created by the system can be installed. Once the certificate
has been installed, it cannot be installed again.
User Response
Only a signed certificate request can be installed.
Use the 'chsystemcert -mkrequest' command to create a certificate
request and then get this request signed by a certificate authority
(CA). The resulting certificate can then be installed.