ssl error

Hi guys! This is my first post here so correct me if I've done anything wrong. My problem is that I recently made a Wordpress website and installed SSL using Cloudflare. The problem is I get this error: NET::ERR_CERT_AUTHORITY_INVALID Also WhynoPadlock results shows that I've Installed SSL...

I tried to install ssl cerfificate but I still got "not secured". I checked with whynopadlock and I got this What does it mean? And How can I solve this problem? Thanks.