Nginx and php-fpm

Hi, I’m trying to run a server from my pc, but I’ve got a problem trying to open index.php (index.html works).
I receive this error:

127.0.0.1 - - [26/Mar/2021:09:32:17 +0100] "GET /index.php HTTP/1.1" 502 494 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:85.0) Gecko/20100101 Firefox/85.0"
127.0.0.1 - - [26/Mar/2021:09:32:18 +0100] "GET /pwa-service-worker.js HTTP/1.1" 404 153 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:85.0) Gecko/20100101 Firefox/85.0"



2021/03/26 09:32:18 [error] 11390#11390: *1 open() "/srv/www/htdocs/pwa-service-worker.js" failed (2: No such file or directory), client: 127.0.0.1, server: localhost, request: "GET /pwa-service-worker.js HTTP/1.1", host: "127.0.0.1"

Thanks