The solution to the error "Missing /etc/ntopng/ntopng.start. Quitting"

I tried to run ntopng once:

sudo /etc/init.d/ntopng start

And got the following start error:

* Missing /etc/ntopng/ntopng.start. Quitting
…fail!

ntopng was started only like this:

sudo /etc/init.d/ntopng force-start

To solve an error, just create an empty file:

sudo touch /etc/ntopng/ntopng.start
sudo /etc/init.d/ntopng restart

The solution to the error “Missing /etc/ntopng/ntopng.start. Quitting”