[Nepomuk] Nepomuk2::ResourceData::setProperty: "setProperty: No two resources can have the same nie:url at the same time."

[Александр Пшеницын]

Hi everyone!
I use python bindings for Nepomuk API from here
http://quickgit.kde.org/?p=scratch%2Fsedwards%2Fpykde4nepomuk2.git
And use this function for tagging http://pastebin.com/7sbSTuKt
And sometimes i get this error, tags not adding:
nepomuk (library) Nepomuk2::ResourceData::setProperty: "setProperty: No two
resources can have the same nie:url at the same time."

Also sometimes function just work done, without any
errors/warnings/messages, but tags not adding.
What i doing wrong and how i can fix those stupid errors?
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