Nagvis: error adding host into map [SOLVED]

Hello to all,
my environment:
CentOS 7.7 (minimal - updated - selinux disabled)
Apache httpd-2.4.6-90.el7.centos.x86_64
PHP 5.4.16
Browser Chrome 77.0.3865.90, Firefox 69.0.1
No JavaScript errors in the browser
No recent errors in /var/etc/httpd/error_log
Nagios 4.4.5 (core edition)
Nagvis 1.9.14

Nagios works fine and I just finished to install Nagvis, I uploaded a background image of my campus (a .gif file) and now I would like to show in Nagvis the hosts monitored by Nagios but when I try to add each one of them I receive the following message:
“Failed to get objects: Unable to connect to livestatus socket. The socket /usr/local/nagios/var/rw/live in backend live_1 does not exist. Maybe Nagios is not running or restarting.”
Can someone please help me?
Best regards
Dario

It seems that the MKLivestatus module is missing. Please take a look at the NagVis documentation.

Hi Wolfang
thank u for replay but MKLivestatus (check-mk-raw-1.6.0p2-el7-38.x86_64.rpm) was been installed before install nagvis
any other suggestion?
Best regards
Dario

“installed” but not enabled in nagios.cfg (although I’m not sure if that’s the right place to do that in Nagios 4).

Hello Wolfang,
I solved by correctly writing the broker_module path in nagios.cfg
Best regards
Dario