Mismatched LaTeX support files detected

Question

I just updated my TeXLive installation on my iMac and got the following error message:
   /usr/local/texlive/2020/texmf-dist/tex/latex/l3kernel/expl3.sty:77: LaTeX3 Error: 
    Mismatched LaTeX support files detected.
    (LaTeX3)        Loading 'expl3.sty' aborted!
    (LaTeX3)        
    (LaTeX3)        The L3 programming layer in the LaTeX format
    (LaTeX3)        is dated 2020-10-27, but in your TeX tree the files require
    (LaTeX3)        at least 2020-12-07.

What to do?

Sino7 · Answer

It may be useful to others: I had to run fmtutil-user --all (rather than fmtutil-sys) to recreate the format in my local tree and fix lualatex.

Mismatched LaTeX support files detected

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