where is error? (Glib::spawn_async)

[Paul Pogonyshev]

Hi.

Where is error in this code fragment?

      std::vector <std::string>  yelp_arguments;

      yelp_arguments.push_back ("yelp");
      yelp_arguments.push_back 
("ghelp:///usr/share/gnome/help/gedit/C/gedit.xml");

      try
        {
          Glib::spawn_async (".", yelp_arguments, std::vector <std::string> (),
                             Glib::SPAWN_SEARCH_PATH);
          return;
        }
      catch (Glib::Error& exception)
        {
          g_print ("%s...\n", exception.what ().c_str ());
        }

I get this in terminal:

    (yelp:14036): Gtk-WARNING **: cannot open display:

and Yelp window is never shown.

Paul
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