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Problem with visualization

Posted: 11 Aug 2017, 11:53
by ivanovic
Hello everyone,
I am new here and I started with easy examples.
In order to visualize a pentagon, I really got the visualization but in terminal I got the message about the error. In other examples (all polytopes are 2-dimensional), I have the same message:
polytope >
(evince:2430): Gtk-CRITICAL **: gtk_widget_show: assertion 'GTK_IS_WIDGET (widget)' failed
What does it mean?
Thank you in advance.