I have applied that solution and it's still showing the same error. Below is the content on the /etc/hosts file

# Your system has configured 'manage_etc_hosts' as True.
# As a result, if you wish for changes to this file to persist
# then you will need to either
# a.) make changes to the master file in /etc/cloud/templates/hosts.debian. tmpl
# b.) change or remove the value of 'manage_etc_hosts' in
#     /etc/cloud/cloud.cfg or cloud-config from user-data
#
127.0.1.1 my dot schooloaded dot com my
127.0.0.1 localhost
127.0.0.1 blog dot schooloaded dot com
127.0.0.1 schooloaded dot org
127.0.0.1 elgold dot schooloaded dot org
127.0.0.1 www dot schooloaded dot org


# The following lines are desirable for IPv6 capable hosts
::1 localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters