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@coyo: what version of calibre are you using?
The error you mention happens if calibre's field metadata is not stored in the database. Field metadata has been there for quite some time, so my suspicion is that you are using an old release of calibre, perhaps all the way back to a release in the 06 range.
If you are, then there is a strong risk that other things will blow up eventually. The PHP server expects to have a recent release, but I don't check for it.
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