Monit daemon - error connecting to the monit daemon

I installed monit and tried to check the status using below command.

monit status

But end up with below error.

monit: error connecting to the monit daemon

How can I fix this?

edit vim /etc/monit/monitrc, starting from line 118 and uncomment below lines

 set httpd port 2812
    use address localhost  # only accept connection from localhost
    allow localhost        # allow localhost to connect to the server and
    allow admin:monit

sudo monit reload to take affect

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Sometimes the problem appears because loopback interface is down . We should bring up the lo interface as follow

root@server:~# ifup lo