[Tex/LaTex] File l3backend-pdfmode.def not found when loading expl3 alternative solution

expl3packages

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?

Best Answer

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

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