Provision Let’s Encrypt certificate

certificate parameter is required when updating an existing certificate

Netlify Domain: https://tiliveresearch.netlify.app/

Domain Bought: https://tiliveresearch.com/

After Linking right with Type @ Value A in IP Address of netlify and CNAME www to tiliveresearch.netlify.app. But the site goes with warning for not secure.

When trying to solve this in netlify but it shows: certificate parameter is required when updating an existing certificate

HELP ME