$ systemctl start emperor.uwsgi

-----------Replace with 

$ service emperor.uwsgi start 


--------I'm trying to star this script (at /etc/init/uwsgi.conf):
# simple uWSGI script

description "uwsgi tiny instance"
start on runlevel [2345]
stop on runlevel [06]

respawn

exec uwsgi --ini /etc/uwsgi/emperor.ini