LaTeX warning explanation needed

[Rich Shepard]

On Thu, 14 Oct 2021, Axel Dessecker wrote:

> LaTeX Warning: There were undefined references.
> Package biblatex Warning: Please (re)run Biber on the file:
> (biblatex)                biological-evaluation
> (biblatex)                and rerun LaTeX afterwards.

In the PWD are these files:
$ ls
#biological-evaluation.lyx#  biological-evaluation.lyx      biological-evaluation.tex.dep-pdf
biological-evaluation.aux    biological-evaluation.lyx.bbl  biological-evaluation.tex.log
biological-evaluation.bcf    biological-evaluation.lyx.blg  biological-evaluation.toc
biological-evaluation.lof    biological-evaluation.pdf
biological-evaluation.log    biological-evaluation.run.xml

I copied the LaTeX/pdflatex output in the /tmp/lyx_* directory.

Then I ran biber on the *.lyx file:
$ biber biological-evaluation.lyx 
INFO - This is Biber 2.14
INFO - Logfile is 'biological-evaluation.lyx.blg'
ERROR - Cannot find 'biological-evaluation.lyx.bcf'!
INFO - ERRORS: 1

but the file is present in the same directory. And it's 102032 bytes in
size.

Please suggest how I trace the error source.

Rich