uwsgi, nginx, and Django/Wagtail

I've been following this tutorial on setting up Django with uwsgi and nginx on a Debian system. (I'm also integrating Django-based CMS Wagtail). My Linode server at 72.14.181.145 runs Debian 9. But when I navigate my browser to the IP address, I get a page that says "Internal server error."

My /var/log/nginx/error.log file is blank.

Here's the output of uwsgi --http :8080 --home /home/myusername/Env/my_site --chdir /home/myusername/my_site -w my_site.wsgi:

*** Starting uWSGI 2.0.17.1 (64bit) on [Mon Jul 30 14:41:53 2018] ***
compiled with version: 6.3.0 20170516 on 29 July 2018 21:47:39
os: Linux-4.9.0-7-amd64 #1 SMP Debian 4.9.110-1 (2018-07-05)
nodename: sandbox
machine: x86_64
clock source: unix
detected number of CPU cores: 1
current working directory: /home/myusername
detected binary path: /usr/local/bin/uwsgi
!!! no internal routing support, rebuild with pcre support !!!
chdir() to /home/myusername/my_site
*** WARNING: you are running uWSGI without its master process manager ***
your processes number limit is 3898
your memory page size is 4096 bytes
detected max file descriptor number: 1024
lock engine: pthread robust mutexes
thunder lock: disabled (you can enable it with --thunder-lock)
uWSGI http bound on :8080 fd 4
spawned uWSGI http 1 (pid: 20358)
uwsgi socket 0 bound to TCP address 127.0.0.1:45939 (port auto-assigned) fd 3
Python version: 3.5.3 (default, Jan 19 2017, 14:11:04)  [GCC 6.3.0 20170118]
Set PythonHome to /home/myusername/Env/my_site
*** Python threads support is disabled. You can enable it with --enable-threads ***
Python main interpreter initialized at 0x55c1438a1920
your server socket listen backlog is limited to 100 connections
your mercy for graceful operations on workers is 60 seconds
mapped 72904 bytes (71 KB) for 1 cores
*** Operational MODE: single process ***
ImportError: No module named 'my_site'
unable to load app 0 (mountpoint='') (callable not found or import error)
*** no app loaded. going in full dynamic mode ***
*** uWSGI is running in multiple interpreter mode ***
spawned uWSGI worker 1 (and the only) (pid: 20357, cores: 1)

How do I figure out what my "internal server error" debug log says? And how do I fix that error so that my Wagtail-powered website displays when I navigate to my Linode server in my browser?