Im not bale to get this work, 6 days, and counting

I’m using Proxmox and using NPM. I installed the latest version, since 6 days trying to check one invoice in PDF, and it didn’t work. I tried everything and finally want to know if this really works. PDF error Correct version: wkhtmitopdf 0.12.x (with patched qt). I updated it. after that non-stop server time, I even updated the proxy_connect_timeout 300s;
proxy_send_timeout 300s;
proxy_read_timeout 300s;
send_timeout 300s;

Nothing changed. Just anyone here, tell me if it really works, I came to know about ERPNext just few weeks ago, while researching about Odoo. Please anyone here, who can help.