Error: Could not read host and service status information!

[BenjaminCoze]

Hello, currently in training my tutor ask me to put his PC in HOST on his Windows PC. I followed a tutorial that told me to use NSClient ++ and also that I had to modify the folder "windows.cfg" "commands.cfg" and "nagios.cfg", so I restarted my server afterwards to validate my changes. Except that when I restarted the Nagios GUI, I got the error message "Error: Could not read host and service status information! On the server I have 2 nagios http://mon_ip/nagios and http://mon_ip/nagios4 , I have to do this work on the nagios4