Quoting http://bugs.debian.org/488909 :

> I run E17 without a system tray, so when I want to show my tasque window I
> click on the tasque icon in the menu.  
> 
> Tasque (correctly) detects a running tasque instance, and that instance shows
> itself on the current desktop, and the new instance exits with a return code
> of 255 and prints the following message:
> [Debug]: Tasque is already running.  Exiting...
> 
> Unfortunately e17 (correctly from my view) detects that the application failed
> to start and shows a dialog to this effect.
> 
> Tasque really should not return an error code in this case (the debug message
> is fine).
> 
> As a user, it seems to me like tasque started correctly (window appeared -
> that's what I wanted), a running process in the background is irrelevant to
> me.  (As a software developer it seems strange to return an error when there
> really isn't any error seems strange - a running process that couldn't be
> contacted would be an error).

Tasque should, of course, exit with 0 if nothing bad happened :) This is with tasque 0.1.6.