Passenger, Plesk and Node.js: How to do HTTP post?

i have problem when i'm trying to send email with nodemailer through basic form. I have a NodeJs-App running with Phusion Passenger and nginx on Plesk. When i'm trying to do HTTP POST i got 500 error.

Administrator error

When i check log in my panel i got only this:

This is my first approach with PLESK as panel, so i can't recognize where is the problem. Log error