Big troubleshootings into NGINX configuration

Hi and thnak you for your answer.

I really would like to send you the complete conf but I really don't know how to edit this config...I am more than a newbie in NGINX. To anser your question, There is no other "/" location into this server.... the only one is:

location / {
try_files $uri $uri/ @opencart;
}
location @opencart {
rewrite ^/(.+)$ /index.php?_route_=$1 last;
}

Thanks a lot for your help

Have a nice day

Yan