[Vala] GDBus doubt

[rastersoft <raster rastersoft com>]

Hi all:

I want to use the freedesktop portal 
(https://github.com/flatpak/xdg-desktop-portal/blob/master/data/org.freedesktop.portal.OpenURI.xml) 
to open a file with another application. I created this test code:

usingGLib;
// using GIO;
usingPosix;
intmain(string[] args) {
varloop =newGLib.MainLoop();
vardbus_connection =Bus.get_sync(BusType.SESSION);
varfichero =Posix.open(args[1], Posix.O_RDONLY, 0);
varfdList =newGLib.UnixFDList();
fdList.append(fichero);
varbuilder =newVariantBuilder(newVariantType("(a{sv})"));
varinParameters =builder.end();
varparameters =newGLib.Variant("(sha{sv})", "0", 0, inParameters);
dbus_connection.call_with_unix_fd_list_sync("org.freedesktop.portal.Desktop", 
"/org/freedesktop/portal/desktop", "org.freedesktop.portal.OpenURI", 
"OpenFile", parameters, newGLib.VariantType("(o)"), DBusCallFlags.NONE, 
100000,fdList);
loop.run();
return0;
}


It works, but when I do "varinParameters =builder.end();" I receive 
these messages:

(process:8011): GLib-CRITICAL **: 22:00:26.531: g_variant_builder_end: 
assertion 'GVSB(builder)->offset >= GVSB(builder)->min_items' failed

(process:8011): GLib-CRITICAL **: 22:00:26.531: g_variant_ref_sink: 
assertion 'value != NULL' failed

Where is my error?

Thanks.

--
Nos leemos
                         RASTER    (Linux user #228804)
raster rastersoft com              http://www.rastersoft.com