Why does my uwsgi app respond with prematurely closed connection?

I can serve my django app running uwsgi --socket lhhs/lhhs.sock --module lhhs/lhhs.wsgi --chmod-socket=664

And the django app runs quick and running python manage.py test shows it is fine.

But uisng nginx and uwsgi-emperor I get upstream prematurely closed connection while reading response header from upstream, client: 74.45.12.120, server: lhhs.oh-joy.org, request: "GET / HTTP/1.1", upstream: "uwsgi://unix:///var/www/webapps/lhhs/lhhs/lhhs.sock:", host: "lhhs.oh-joy.org"

Here is my .ini file:

uid = www-data
chdir=/var/www/webapps/lhhs/lhhs
home=/var/www/webapps/lhhs/env
home=/var/www/webapps/lhhs/env
module=lhhs.wsgi:application
master=True
pidfile=/tmp/project-master.pid
vacuum=True
max-requests=5000
daemonize=/var/www/webapps/lhhs/log/lhhs-uwsgi.log
socket=/var/www/webapps/lhhs/lhhs/lhhs.sock
chmod-socket = 664

Here is my nginx config:

upstream django {
     server unix:///var/www/webapps/lhhs/lhhs/lhhs.sock; # for a file socket
    #server 127.0.0.1:8001; # for a web port socket (we'll use this first)
}

server {
    listen 443 ssl;
    server_name lhhs.oh-joy.org;
    charset utf-8;
    ssl_certificate /etc/letsencrypt/live/lhhs.oh-joy.org/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/lhhs.oh-joy.org/privkey.pem; # managed by Certbot

    location /static {
    alias /var/www/webapps/lhhs/lhhs/static;
   }

    location /media {
    alias /var/www/webapps/lhhs/lhhs/media;
   }

   location /favicon.ico {
       alias /var/www/webapps/lhhs/lhhs/static/images/favicon.ico;
   }

    location / {
        include         /etc/nginx/uwsgi_params;
        uwsgi_pass      django;
    }


}


server {
    if ($host = lhhs.oh-joy.org) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


    listen 80;
    server_name lhhs.oh-joy.org;
    return 404; # managed by Certbot


}

upstream django {
     server unix:/var/www/webapps/lhhs/lhhs/lhhs.sock; # for a file socket
    #server 127.0.0.1:8001; # for a web port socket (we'll use this first)
}