Why can't I export spreadsheet to PDF?

I’ve attempted both “fast” and detailed pathways to export and always get an error saying that it “can’t read” the spreadsheet for PDF. Any idea what’s wrong? I haven’t a clue.

I am on Win 10 and just tried a (very simple) export from a sheet in LibO 5.1.2 to a pdf. It worked flawlessly.
Would you mind to give more information (OS, Ver) and to describe in detail what you already tried and to what effect.

I submitted that and have since found that if I deselect General>Embed…, General>View…, and specify create PDF, I get the desired PDF. I am on Mac OS 10.111.3 BTW. Also had to change my logins because of the very confusing entry path. Ugh. Got the Holy Grail there, DF?