DNSSEC signing failed?
Oct 30 09:52:26 pagan knot[7976]: Loading 17 zones...
Oct 30 09:52:26 pagan knot[7976]: Loaded zone 'rfc6594.org.' serial 1383121861
Oct 30 09:52:26 pagan knot[7976]: Loaded zone 'slea8.cz.' serial 1383121861
Oct 30 09:52:26 pagan knot[7976]: Zone 'sury.cz.' is up-to-date, no need for reload.
Oct 30 09:52:26 pagan knot[7976]: Loaded zone 'angora.cz.' serial 1383121861
Oct 30 09:52:26 pagan knot[7976]: Loaded zone 'rfc1925.org.' serial 1383121861
Oct 30 09:52:26 pagan knot[7976]: Loaded zone 'sury.name.' serial 2008053249
Oct 30 09:52:26 pagan knot[7976]: Loaded zone 'sura.name.' serial 2010105158
Oct 30 09:52:26 pagan knot[7976]: Loaded zone 'surykatka.cz.' serial 1383121861
Oct 30 09:52:26 pagan knot[7976]: Loaded zone 'sury.org.' serial 1383121861
Oct 30 09:52:26 pagan knot[7976]: Loaded zone 'e-psychologie.cz.' serial 1383121861
Oct 30 09:52:26 pagan knot[7976]: Loaded zone 'deb-php.org.' serial 1383121861
Oct 30 09:52:26 pagan knot[7976]: Loaded zone 'php-deb.org.' serial 1383121861
Oct 30 09:52:26 pagan knot[7976]: Loaded zone 'debphp.org.' serial 1383121861
Oct 30 09:52:26 pagan knot[7976]: Loaded zone 'phpdeb.org.' serial 1383121861
Oct 30 09:52:26 pagan knot[7976]: Loaded zone 'udp53.cz.' serial 1383121861
Oct 30 09:52:26 pagan knot[7976]: Loaded zone 'tlsa.cz.' serial 1383121861
Oct 30 09:52:26 pagan knot[7976]: Loaded zone '8-15.130.187.89.in-addr.arpa.' serial 1383121861
Oct 30 09:52:26 pagan knot[7976]: Loaded 17 out of 17 zones.
Oct 30 09:52:26 pagan knot[7976]: Configuration reloaded.
Oct 30 10:52:26 pagan knot[7976]: [warning] Failed to apply differences 'sury.cz.' to '/etc/knot/zones/sury.cz'
Oct 30 10:52:26 pagan knot[7976]: [warning] Failed to apply differences of 'sury.cz.' to zonefile.
What does that even mean?