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When I try to compile a .tex file with no additional \usepackage, I get the following error:

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

Following this thread I ran tlmgr update --all and tlmgr update --self, but I still got the error. I noticed that there is no l3backend-pdfmode.def in the directory l3backend:

C:\texlive\2020\texmf-dist\tex\latex\l3backend
2020/10/16 18:54 .
2020/10/16 18:54 ..
2020/10/16 16:13 24,777 l3backend-dvipdfmx.def
2020/10/16 16:13 32,860 l3backend-dvips.def
2020/10/16 16:13 17,860 l3backend-dvisvgm.def
2020/10/16 16:13 24,060 l3backend-luatex.def
2020/10/16 16:13 23,704 l3backend-pdftex.def
2020/10/16 16:13 26,739 l3backend-xetex.def

I am guessing that I have to add `l3backend-pdfmode.def' manually, but how can I do that?

hullhull
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    you have an old latex format that is still looking for the old name possibly a local one that is masking the one installed by your update, you should be able to delete it. – David Carlisle Oct 16 '20 at 10:10
  • If pdf mode is searched you probably have an old local format somewhere. Check with kpsewhich --all -engine=pdftex pdflatex.fmt – Ulrike Fischer Oct 16 '20 at 10:12
  • Deleting pdflatex.fmt worked! Thank you so much. – hullhull Oct 16 '20 at 10:22

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