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After updating TexStudio to 3.0.1 I've faced with problem. When I try to compile file, that I have compiled many times earlier, I get error with text: "File `l3backend-pdfmode.def' not found. \begin{document}". What is wrong? My code is: \documentclass[a4paper,12pt]{article} \begin{document} text \end{document}

.log file content:

This is pdfTeX, Version 3.14159265-2.6-1.40.21 (TeX Live 2020/W32TeX)        (preloaded format=pdflatex 2020.5.21)  6 SEP 2020 19:42
entering extended mode
restricted \write18 enabled.
%&-line parsing enabled.
**document.tex
(./document.tex
LaTeX2e <2020-02-02> patch level 5
L3 programming layer <2020-05-15>
(c:/texlive/2020/texmf-dist/tex/latex/base/article.cls
Document Class: article 2019/12/20 v1.4l Standard LaTeX document class
(c:/texlive/2020/texmf-dist/tex/latex/base/size12.clo
File: size12.clo 2019/12/20 v1.4l Standard LaTeX file (size option)
)
\c@part=\count167
\c@section=\count168
\c@subsection=\count169
\c@subsubsection=\count170
\c@paragraph=\count171
\c@subparagraph=\count172
\c@figure=\count173
\c@table=\count174
\abovecaptionskip=\skip47
\belowcaptionskip=\skip48
\bibindent=\dimen134
)

! LaTeX Error: File `l3backend-pdfmode.def' not found.


Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: def)


Enter file name: 
! Emergency stop.
<read *>


l.2 \begin{document}
                ^^M
*** (cannot \read from terminal in nonstop modes)


Here is how much of TeX's memory you used:
 223 strings out of 480476
 2655 string characters out of 5903481
 239159 words of memory out of 5000000
 16342 multiletter control sequences out of 15000+600000
 532636 words of font info for 25 fonts, out of 8000000 for 9000
 1141 hyphenation exceptions out of 8191
 24i,0n,21p,141b,36s stack positions out of    5000i,500n,10000p,200000b,80000s
!  ==> Fatal error occurred, no output PDF file produced!
Kirill Murashev
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    unrelated to texstudio (that is just the editor you are using) but update your tex distribution it looks like you have mis-matched expl3 files – David Carlisle Sep 05 '20 at 19:21
  • your document runs without error (but several warnings about obsolete options) if you add \end{document}, tested with an up to date texlive 2020. – David Carlisle Sep 05 '20 at 20:16
  • Thank You, but after update of TexLive problem still remains. Of course I have \end{document} in its last line. The full error text follows me to line 77 in .sty file, but I haven't any idea what is wrong in its code. – Kirill Murashev Sep 05 '20 at 21:24
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    make the smallest document that you can make that shows the error (probably you just need \documentclass{article}\begin{document}\end{document} then edit your question to show that example and the full log file that you get – David Carlisle Sep 05 '20 at 21:31
  • I did. The error changed, but still remains at all. – Kirill Murashev Sep 06 '20 at 16:48
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    the file changed at a recent release (was l3backend-pdfmode.def, now l3backend-pdftex.def and l3backend-luatex.def) it seems that you have an inconsistent set do tlmgr update --all and possibly fmtutil-sys --all to rebuild the formats – David Carlisle Sep 06 '20 at 19:45
  • I've used both commands. It works. Thank You a lot, David! – Kirill Murashev Sep 07 '20 at 11:54

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