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I have a problem compiling documents - if I use expl3 package, I get an error l3backend error saying ! LaTeX Error: File `l3backend-pdfmode.def' not found. My problem is that installing l3backend package (as suggested as an answer to this question) does not resolve the problem. I tried installing the package the same way as all my packages - using \usepackage{l3backend} in my document like this

\documentclass{article} 
\usepackage{expl3}
\usepackage{l3backend}

\begin{document}
Hi!
\end{document}

I get no windows asking me for package installation permission as I usually do when including a new package and I keep getting the same error. What am I doing wrong?

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    install the l3backend package with the package manager of your tex system. – Ulrike Fischer Jul 9 at 13:47
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    your mention of a "window" probably means that you are using miktex. In this case update the package data base in the miktex console. There is an icon "Update DB" above the list of packages. – Ulrike Fischer Jul 9 at 13:57
  • And you should never \usepackage{l3backend}. The correct backend package is selected automatically by expl3: loading it manually will usually be wrong. – Phelype Oleinik Jul 9 at 14:01
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I followed Ulrike's comment.

In this case update the package data base in the miktex console. There is an icon "Update DB" above the list of packages.

And also deleted \usepackage{l3backend} from my code as Phelype suggested. That solved it. Thanks

  • 1
    If this answer solved your problem, it's fine to mark it as accepted even if you posted it yourself. This question then won't show up in the list of unanswered questions anymore. – siracusa Jul 10 at 8:27
  • 2
    I would, but it is only possible to accept my own answer after a period of 2 days since I posted it. That is why it's unmarked yet. – Martin Jul 11 at 9:57

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