2015-04-22 8:52 GMT+02:00 Jürgen Spitzmüller:

>
> This is a known (and obviously hard to fix) problem of biber. Some times
> (though very unfrequently) it tries to access such invalid cache folders.
> Deleting them always solves the problem. See
>
> http://tex.stackexchange.com/questions/140814/biblatex-biber-fails-with-a-strange-error-about-missing-recode-data-xml-file?lq=1
>

The problem (and solution) was actually also documented on our Biblatex
wiki page, although maybe a bit hidden. I tried to make it a bit more
prominent. See section "Known problems" at
http://wiki.lyx.org/BibTeX/Biblatex

Jürgen


>
> Jürgen
>

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