Installing Ninja with Iredmail error

Hello i’m trying to install Ninja with IRedMail when trying to go to the website for Ninja I get 403 error, it uses templates on nginx I never used them before and don’t know how to configure it to get it working… Could someone help me

atm trying to do it with

ninja.tmpl
inside
location / {
root /var/www/ninja/invoiceninja/public/;
try_files $uri $uri/ /index.php?$query_string;
}

location ~ \.php$ {
           include snippets/fastcgi-php.conf;
           fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
           fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
           include fastcgi_params;
}

but I get file not found

Does this folder exist?

/var/www/ninja/invoiceninja/public/

yes

Sorry, I’m not sure