LaTeX warning explanation needed

[Rich Shepard]

On Thu, 14 Oct 2021, Axel Dessecker wrote:

> starting from line 847 of your log file you find the following information:
> LaTeX Warning: There were undefined references.
> Package biblatex Warning: Please (re)run Biber on the file:
> (biblatex)                biological-evaluation
> (biblatex)                and rerun LaTeX afterwards.

Axel,

Warnings are just that; they don't prevent compiling the document.

The error must be with biblatex, Biber, or the database. I scanned the
latter for non-ASCII characters (it's in utf-8 encoding) and found none.

I'll read the biblatex.pdf again to learn how to run biber on the database;
I guess that's the place to start.

Rich