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I'm trying to figure out what this means and how to fix it in keychain access?

I've read just about everything I can regarding this but no one seems to offer any simple steps to resolve this situation. I'm guessing that the original developer certificates were created by an employee who is no longer with our company and his laptop is no longer accessible - it's been wiped. I deleted all the certificates from my keychain and recreated new developer certificates so that we can code sign apps - not for any of the app stores just for distribution on our website. However, none of them have a private key so I need to be able to create private keys for them. Does anyone know how to do this? Every thing I've tried has failed.