Mismatched LaTeX support files detected.

[Joseph Wright]

On 31/01/2022 08:48, Sergio Callegari wrote:
> Hi,
> 
> since the latest |tlmgr update| my TeXlive is broken.
> 
> I am getting
> 
> |! 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 2022-01-12, but in your TeX tree 
> the files require (LaTeX3) at least 2022-01-21. |
> 
> Is this a common problem?
> 
> Best,
> 
> Sergio

Usually it happens if you have some stray local files: can you show us 
your .log?

Joseph