I obtain a empty postscript documment when I print in a file

["J. L. Pino" <galastiko gmail com>]

When I print a certain dia file to a postscript documment I obtain a empty file. However I copy the contest of this diagram to other and Dia print it fine in a file.
I can't print in a printer because I haven't lpr.
I sure that the problems isn't in my postscript viewer because I has used two (evince and gimp).

I attach the file.

Attachment: DSS_bad.dia
Description: application/dia-diagram