P: (Win/Mac) Lightroom Classic 12.0 Unable to export: Watermarking Failed

Here's the way I fixed the issue:

In the export panel check the watermark selection > select "edit watermarks" in the dropdown > choose (dropdown arrow) > click on one of your existing watermarks or choose an image for your watermark, select done.

Then you can uncheck the watermark selection in the export panel and it should now work normally. 

I'm grateful for all the advice on this thread. However, the approach that worked best for me was to uninstall this version of LC and revert back to one that could actually accomplish a basic, simple task without wasting time and energy. Adobe, please: if something works, just leave it alone. 

Were you able to read the correct answers and did these solve your problem? Many others found the same situation and Sameer K's suggestions all worked.

Can´t export a photo!!

Lightroom watermarking failed -Unable to export since the latest update!

What is the problem???

[Merged to correct forum and thread - Mod.]

Não estou conseguindo exportar meus arquivos do Lightroom. Aparece a mensagem: FALHA NA MARCA D'AGUA. Sendo que a opção de Marca D'agua nem está selecionada.

I created a blank watermark and used that

I created a blank watermark and used that and it worked