This is a problem I encountered when setting up Envoyer on some of my Forge-provisioned Digital Ocean droplets.
And here is a step-by-step quick fix that works!
First create a file:
sudo nano /etc/init/php5-fpm.override
and add one line to it:
reload signal USR2
then you need to kill the php5-fpm service and restart it:
sudo pkill php5-fpm; sudo service php5-fpm start
and now this should work fine:
sudo service php5-fpm reload