Self / Comodo SSL giving issue for 2nd domain or wp website

Installing 2nd new ssl for my 2nd domain giving me a issue. I am using fresh new ssl for my 2nd domain from Namecheap Positive SSL.

After completing all the process and using the “ee service reload nginx-proxy” command, getting following error. Please guide me…

root@182b5:/# ee service reload nginx-proxy
Custom dhparam.pem file found, generation skipped
2019/05/23 12:56:37 Contents of /etc/nginx/conf.d/default.conf did not change. Skipping notification ‘’
nginx: [emerg] SSL_CTX_use_PrivateKey_file("/etc/nginx/certs/www.kellan.design.key") failed (SSL: error:0B080074:x509 certificate routines:X509_check_private_key:k ey values mismatch)
nginx: configuration file /etc/nginx/nginx.conf test failed
nginx: [emerg] SSL_CTX_use_PrivateKey_file("/etc/nginx/certs/www.kellan.design.key") failed (SSL: error:0B080074:x509 certificate routines:X509_check_private_key:k ey values mismatch)

Success: Reloaded global-nginx-proxy.

Regards