snap and dbus

[Vasilisc]

I got the problem (GTK/Perl app in snap package)
(pac:4653): Unique-DBus-WARNING **: Error while sending message: The 
name org.pacmanager.PAC was not provided by any .service files

This problem similar
https://github.com/ubuntu/snappy-playpen/wiki/Known-issues

.service files (like thumbler in ristretto):
aren't accessible ** (ristretto:11165): WARNING **: DBUS-call failed:The 
name org.freedesktop.thumbnails.Thumbnailer1 was not provided by any 
.service files

What should I do?
-- 
Best regards,
vasilisc