TaksCoach 1.4.1 (debian designation 1.4.1-4) on Debian 8.3 (current of 2016-01-24)
When trying to print (File -> Print), an error dialog is shown "Error while printing: ???".
Ctrl+P gives the same.
When opening Print Preview, and then printing leftmost "printer" icon, printer choice dialog is open, and printing continues just fine.