Not found nagios index page

I have installed Nagios on server following manual: http://linuxcalling.blogspot.com/2016/0 ... -root.html
but after running it page is not found:
Not Found
The requested URL /nagios/index.php was not found on this server.
Error in logs show:
[Wed Oct 10 14:48:15.520899 2018] [:error] [pid 2085:tid 139654527371008] [client 10.247.250.104:52692] script '/var/opt/user/monitoring/nagios/shareindex.php' not found or unable to stat
but location to index page is on location and '/' is missing:
/var/opt/user/monitoring/nagios/share/index.php
Anybody know how to fix this?
but after running it page is not found:
Not Found
The requested URL /nagios/index.php was not found on this server.
Error in logs show:
[Wed Oct 10 14:48:15.520899 2018] [:error] [pid 2085:tid 139654527371008] [client 10.247.250.104:52692] script '/var/opt/user/monitoring/nagios/shareindex.php' not found or unable to stat
but location to index page is on location and '/' is missing:
/var/opt/user/monitoring/nagios/share/index.php
Anybody know how to fix this?