gui_path←'/home/dalyw/staging/GTK_sample_app.ui'
      gtk_handle←⎕GTK gui_path
DOMAIN ERROR
      gtk_handle←⋆⎕GTK⋆gui_path
                      ^^
      gtk_handle←⎕GTK gui_path
      
(Gtk_server:6525): GLib-WARNING **: 10:39:47.302: In call to g_spawn_sync(), exit status of a child process was requested but ECHILD was received by waitpid(). See the documentation of g_child_watch_source_new() for possible causes.
Gtk_server: Gtk_server.cc:490: void cmd_3_show_GUI(): Assertion `window' failed.

      )clear
CLEAR WS
      gui_path←'/home/dalyw/staging/GTK_jurgen.ui'
      gtk_handle←⎕gtk gui_path
      
(Gtk_server:6550): GLib-WARNING **: 10:42:52.716: In call to g_spawn_sync(), exit status of a child process was requested but ECHILD was received by waitpid(). See the documentation of g_child_watch_source_new() for possible causes.