What is wrong with my upstart job file?

I wrote a little script for upstart and included a log function in the executable file, but there is no log output. When starting the program manually, it works fine.
Here is the

.conf

file located in

/etc/init/

:

description "upstart file for the program"

start on startup
stop on shutdown

respawn

exec /usr/local/bin/program

I am using Ubuntu 14.04 LTS with upstart 1.12.1.