Build fails: Cannot convert from 'Gdk.Pixbuf' to 'string?'

[Rick Kerkhof]

[ 10%] Generating AyatanaIndicator.c;Indicator.c;IndicatorFactory.c;IndicatorObject.c;IndicatorIface.c;IndicatorLoader.c;IndicatorButton.c;SubMenuButton.c
warning: --save-temps has no effect when -C or --ccode is set
/tmp/pacaurtmp-rkerkhof/wingpanel-indicator-ayatana-bzr/src/wingpanel-indicator-ayatana/src/AyatanaIndicator.vala:262.63-262.74: error: Argument 2: Cannot convert from `Gdk.Pixbuf' to `string?'
                button = new Wingpanel.Widgets.Button (label, image.pixbuf);
                                                              ^^^^^^^^^^^^
Compilation failed: 1 error(s), 1 warning(s)