By running debuild, I find the following warnings:
# debuild
debuild: warning: debian/changelog(l1): badly formatted heading line
LINE: my_package (0.3-1) unstable; urgency=low
Where is my mistake?
Here is my debian/changelog
my_package (0.3-1) trusty; urgency=low
* First release:
-- My Name <mymail@gmail.com> Tue Oct 11 21:22:15 CEST 2016