Brought back an old error

The issue I am facing:
when i go to http://192.168.0.100/admin/ i get:
Failed Host Check: 192.168.0.100 vs 192.168.0.169, , _, pi.hole, localhost

Details about my system:
raspberry pi 3b+ running dietpi 7.6.2
pihole 5.5/adminFTL 5.7/ FTL 5.10.2

nginx config:

server {
    listen 80 default_server;
    listen [::]:80 default_server;

    root /var/www/html;
    server_name _;
    autoindex off;
    access_log /var/log/nginx/local/pihole.access.log;
    error_log /var/log/nginx/local/pihole.error.log;

    index pihole/index.php index.php index.html index.htm;

    location / {
        expires max;
        try_files $uri $uri/ =404;
    }

    location ~ \.php$ {
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $document_root/$fastcgi_script_name;
        fastcgi_pass unix:/run/php/php-fpm.sock;
        fastcgi_param FQDN true;
        #auth_basic "Restricted"; # For Basic Auth
        #auth_basic_user_file /etc/nginx/.htpasswd; # For Basic Auth
    }

    location /*.js {
        index pihole/index.js;
        #auth_basic "Restricted"; # For Basic Auth
        #auth_basic_user_file /etc/nginx/.htpasswd; # For Basic Auth
    }

    location /admin {
        root /var/www/html;
        index index.php index.html index.htm;
        #auth_basic "Restricted"; # For Basic Auth
        #auth_basic_user_file /etc/nginx/.htpasswd; # For Basic Auth
    }

    location ~ /\.ht {
        deny all;
    }
}

it looks like this error has already been fixed before: Failed Host Check · Issue #280 · pi-hole/AdminLTE · GitHub
i tried to edit "/var/www/html/admin/php/auth.php" as suggested in the post but its not there(probably due to the program being updated over 5 years)

fixed it with editing the setupvars.conf