How to handle error (Could not evaluate: Could not load data from xxx) in satellite 6 ?

Issue

• User meets below error,when he installs satellite 6 server.

[root@vmpxxh02 ~]# katello-installer --katello-proxy-url=http://proxy5xxxxx --katello-proxy-port=15520
 /usr/share/foreman/script/foreman-config -k ssl_ca_file -v '/etc/foreman/proxy_ca.pem' -k ssl_certificate -v '/etc/foreman/client_cert.pem' -k ssl_priv_key -v '/etc/foreman/client_key.pem' returned 1 instead of one of [0]
 /Stage[main]/Certs::Foreman/Exec[foreman_certs_config]/returns: change from notrun to 0 failed: /usr/share/foreman/script/foreman-config -k ssl_ca_file -v '/etc/foreman/proxy_ca.pem' -k ssl_certificate -v '/etc/foreman/client_cert.pem'-k ssl_priv_key -v '/etc/foreman/client_key.pem' returned 1 instead of one of [0]
 /Stage[main]/Foreman_proxy::Register/Foreman_smartproxy[vmpaxxxxx]: Could not evaluate: Could not load data from https://vmpxxxx
Installing             Done                                               [100%] [...................................................]
  Something went wrong! Check the log for ERROR-level output
  The full log is at /var/log/katello-installer/katello-installer.log