awn build fail

awn-panel-dispatcher.vala:98.18-98.52: warning: unhandled error `DBus.Error'
      var conn = DBus.Bus.get (DBus.BusType.SESSION);
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
awn-panel-dispatcher.vala:105.7-105.37: warning: unhandled error `GLib.Error'
      panel.add_applet (desktop_file);
      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
awn-panel-dispatcher.vala:109.7-109.31: warning: unhandled error `GLib.Error'
      panel.delete_applet (uid);
      ^^^^^^^^^^^^^^^^^^^^^^^^^
awn-panel-dispatcher.vala:116.14-116.61: warning: unhandled error `GLib.Error'
      return panel.docklet_request (min_size, shrink, expand);
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
awn-panel-dispatcher.vala:129.7-135.48: warning: unhandled error `GLib.Error'
awn-panel-dispatcher.vala:154.7-154.41: warning: unhandled error `GLib.Error'
      panel.set_applet_flags (uid, flags);
      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
awn-panel-dispatcher.vala:70.60-70.64: error: GVariant deserialization of type `GLib.Value' is not supported
    public signal void property_changed (string prop_name, Value value);
                                                           ^^^^^

** (valac:9700): CRITICAL **: vala_gvariant_module_get_basic_type_info: assertion `signature != NULL' failed
awn-panel-dispatcher.vala:48.44-48.55: error: GVariant serialization of type `DBus.BusName' is not supported
    public abstract uint inhibit_autohide (DBus.BusName sender,
                                           ^^^^^^^^^^^^

** (valac:9700): CRITICAL **: vala_gvariant_module_get_basic_type_info: assertion `signature != NULL' failed
awn-panel-dispatcher.vala:57.36-57.47: error: GVariant serialization of type `DBus.BusName' is not supported
    public abstract void set_glow (DBus.BusName sender,
                                   ^^^^^^^^^^^^

** (valac:9700): CRITICAL **: vala_gvariant_module_get_basic_type_info: assertion `signature != NULL' failed
awn-panel-dispatcher.vala:48.44-48.55: error: GVariant deserialization of type `DBus.BusName' is not supported
    public abstract uint inhibit_autohide (DBus.BusName sender,
                                           ^^^^^^^^^^^^

** (valac:9700): CRITICAL **: vala_gvariant_module_get_basic_type_info: assertion `signature != NULL' failed
awn-panel-dispatcher.vala:57.36-57.47: error: GVariant deserialization of type `DBus.BusName' is not supported
    public abstract void set_glow (DBus.BusName sender,
                                   ^^^^^^^^^^^^
awn-panel-dispatcher.vala:70.60-70.64: error: GVariant serialization of type `GLib.Value' is not supported
    public signal void property_changed (string prop_name, Value value);
                                                           ^^^^^
Compilation failed: 6 error(s), 6 warning(s)
make[2]: *** [awn-core.vala.stamp] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2
==> ERROR: A failure occurred in build().
    Aborting...