I have created a ticket to ask that roscreate-pkg inform the user that
the package name is illegal:
https://code.ros.org/trac/ros/ticket/2752

On Mon, 2010-05-31 at 20:01 -0400, Bill Morris wrote:
> On Tue, 2010-06-01 at 09:54 +1000, Dave.Haddon@csiro.au wrote: 
> > Hi,
> > 
> > I have been working through the tutorials and have coma across a problem.
> > In the CreatingPackage tutorial.
> > 
> > I created a package called lcd-display (This is functionality that I want to
> > do first).  Everything seemed to work until I got to the CreatingMsgAndSrv
> > tutorial where 'rosmsg show' would not work on my created message.
> 
> http://www.ros.org/wiki/PyStyleGuide
> 
> You want to rename it to lcd_display
> 
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