doubt on assertion

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Hi,

I have a doubt on this situation:

gboolean visible[19]= {TRUE,....};
extern GtkWidget *view;

.....

for (i = 0; i < 19; i++)
  {
          column = gtk_tree_view_get_column (GTK_TREE_VIEW(view),i);
          gtk_tree_view_column_set_visible (GTK_TREE_VIEW_COLUMN(column),
visible[i]);
  }

Program works correctly but I got on shell:

(app1:2816): Gtk-CRITICAL **: file gtktreeviewcolumn.c: line 1558 (gtk_tree_view_column_set_visible):
assertion `GTK_IS_TREE_VIEW_COLUMN (tree_column)' failed

(repeated 19 times - cicle 'for')

Why???

Thanks,
France

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