Biber/Biblatex problem (Use of uninitialized value)

Question

So I had a paper ready for a presentation tomorrow, and I decided to add a new reference. Bad idea, this happened when I compiled:

Use of uninitialized value $name in string eq at C:\Users\kevinalh\AppData\Local\Temp\par-6b6576696e616c68\cache-48b1414b522013718507ac7cc0b21aa1f37b24ea\inc\lib/Biber/SortLists.pm line 77.

Use of uninitialized value $pre in regexp compilation at C:\Users\kevinalh\AppData\Local\Temp\par-6b6576696e616c68\cache-48b1414b522013718507ac7cc0b21aa1f37b24ea\inc\lib/Biber/Internals.pm line 959.

Use of uninitialized value $thislocale in concatenation (.) or string at C:\Users\kevinalh\AppData\Local\Temp\par-6b6576696e616c68\cache-48b1414b522013718507ac7cc0b21aa1f37b24ea\inc\lib/Biber.pm line 2767.

Use of uninitialized value $thislocale in concatenation (.) or string at C:\Users\kevinalh\AppData\Local\Temp\par-6b6576696e616c68\cache-48b1414b522013718507ac7cc0b21aa1f37b24ea\inc\lib/Biber.pm line 2854.

Use of uninitialized value $thislocale in concatenation (.) or string at C:\Users\kevinalh\AppData\Local\Temp\par-6b6576696e616c68\cache-48b1414b522013718507ac7cc0b21aa1f37b24ea\inc\lib/Biber.pm line 2859.

Use of uninitialized value $lname in concatenation (.) or string at C:\Users\kevinalh\AppData\Local\Temp\par-6b6576696e616c68\cache-48b1414b522013718507ac7cc0b21aa1f37b24ea\inc\lib/Biber.pm line 1929.

Use of uninitialized value $lssn in concatenation (.) or string at C:\Users\kevinalh\AppData\Local\Temp\par-6b6576696e616c68\cache-48b1414b522013718507ac7cc0b21aa1f37b24ea\inc\lib/Biber.pm line 1929. Use of uninitialized value $lssn in concatenation (.) or string at C:\Users\kevinalh\AppData\Local\Temp\par-6b6576696e616c68\cache-48b1414b522013718507ac7cc0b21aa1f37b24ea\inc\lib/Biber.pm line 1943. Use of uninitialized value $lssn in concatenation (.) or string at C:\Users\kevinalh\AppData\Local\Temp\par-6b6576696e616c68\cache-48b1414b522013718507ac7cc0b21aa1f37b24ea\inc\lib/Biber.pm line 1958.

Can't use an undefined value as an ARRAY reference at C:\Users\kevinalh\AppData\Local\Temp\par-6b6576696e616c68\cache-48b1414b522013718507ac7cc0b21aa1f37b24ea\inc\lib/Biber/Internals.pm line 949.

INFO - This is Biber 2.1
INFO - Logfile is 'document.blg'
INFO - Reading 'document.bcf'
WARN - Warning: Found biblatex control file version 2.6, expected version 2.7
INFO - Found 1 citekeys in bib section 0
INFO - Processing section 0
INFO - Looking for bibtex format file 'document.bib' for section 0
INFO - Decoding LaTeX character macros into UTF-8
INFO - Found BibTeX data source 'document.bib'
INFO - Overriding locale '' defaults 'variable = shifted' with 'variable = non-ignorable'
INFO - Overriding locale '' defaults 'normalization = NFD' with 'normalization = prenormalized'
INFO - Sorting list 'nty' of type 'entry' with scheme 'nty' and locale ''
INFO - No sort tailoring available for locale ''

Things to consider:

• I've upgraded all the packages using MikTeX some days ago but didn't update the bibliography until today.
• MikTeX online repositories are not working these days apparently

• Using \listfiles, I get:

  biblatex.sty 2014/06/25 v2.9a programmable bibliographies (PK/JW/AB) biblatex2.sty 2014/06/25 v2.9a programmable bibliographies (biber) (PK/JW/AB )

• Considering the repositories aren't working, I got the biblatex-3.0.tds.tgz file and uncompressed it in the MikTeX folder, before refreshing FNDB via the MikTeX Options.

I've already tried deleting the par- cache folder and the .aux, .bbl and .bcf files, and running a minimal working example:

\documentclass{article}

\usepackage[backend=biber]{biblatex}

\addbibresource{document.bib}

\begin{document}
    Lorem ipsum dolor sit amet
    \cite{A01}
    \printbibliography 
\end{document}

With document.bib being:

@misc{A01,
  author = {Author, A.},
  year = {2001},
  title = {Alpha},
}

With no success.

Any help is really appreciated.

Answer 1

Your biblatex is too old. Probably you would need to run the user update manager to update it. As the miktex repositories are not online: either downgrade biber to version 1.9: https://sourceforge.net/projects/biblatex-biber/files/biblatex-biber/.

Or update biblatex: Get from a CTAN mirror the biblatex miktex packages:

http://mirrors.ctan.org/systems/win32/miktex/tm/packages

Download also from the same mirror the two package databases:

http://mirrors.ctan.org/systems/win32/miktex/tm/packages/miktex-zzdb1-2.9.tar.lzma http://mirrors.ctan.org/systems/win32/miktex/tm/packages/miktex-zzdb2-2.9.tar.lzma

Put everything in some empty folder (outside miktex), and then choose this folder as local repository in the package manager or update manager.