pdf version error with lyx-2.4devel

[Neal Becker]

Trying to run lualatex.  An included graphic was produced by pdfcrop
 pdfcrop --version
pdfcrop 2020/06/06 v1.40

I get no pdf file, I think the problem comes from this:

warning (file
export_autoencoder_sspa_2sps_3_32apsk_linear_co___73b4b4c71ce2ff5

bbf283ce565b0b314f893e8bc937.pdf) (pdf inclusion): PDF inclusion: found PDF
vers

ion '1.7', but at most version '1.5' allowed


Any ideas?
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