[Evolution] Flatpak build issue

[Japhering <japhering gmail com>]

I built the evolution flatpak

gnome-sdk 3.28,  with evolution 3.26

build comes out clean, but running it results in

    flatpak run org.gnome.Evolution

        (evolution.bin:39): GLib-GIO-CRITICAL **: g_dbus_proxy_new:
        assertion 'G_IS_DBUS_CONNECTION (connection)' failed

        (evolution.bin:39): GLib-GIO-CRITICAL **: g_dbus_proxy_new:
        assertion 'G_IS_DBUS_CONNECTION (connection)' failed

        (evolution.bin:39): GLib-GIO-CRITICAL **: g_dbus_proxy_new:
        assertion 'G_IS_DBUS_CONNECTION (connection)' failed

        (evolution.bin:39): GLib-GIO-CRITICAL **: g_dbus_proxy_new:
        assertion 'G_IS_DBUS_CONNECTION (connection)' failed

        (evolution.bin:39): GLib-GIO-CRITICAL **: g_dbus_proxy_new:
        assertion 'G_IS_DBUS_CONNECTION (connection)' failed

        (evolution.bin:39): Gtk-WARNING **: Can't open portal file
        chooser: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown:
        The name org.freedesktop.portal.Desktop was not provided by any
        .service files

On bring up, I'm at the point where I need to pick the backup file to 
use to populate the flatpak version.  I'm clicking the browse link
which results in the last error.

Mike