Error when trying to obtain a certificate: The specified item could not be found in the keychain

I was having a problem with codesigning my apps, so I deleted all the keys from the keychain. Then I went to Certificate Assistant => Request a certificate from a Certificate Authority (to create CSR for a new certificate).

So enter my email address and here's what I get:

The specified item could not be found in the keychain.

What am I doing wrong?

P.S. When I'm trying to Create a Certificate Authority, I get the same error.

How do I get a certificate authority certificate on a Mac?

In the Keychain Access app on your Mac, choose Keychain Access > Certificate Assistant > Request a Certificate From a Certificate Authority. Enter your email address, name, and the email address of the certificate authority you want to issue you the certificate, then click Continue.

I solved it. Ensure you are in the "Certificates" section and you select "Apple Worldwide Developer Relations Certification Authority" before requesting a certificate.