Are you sure you're running the latest Yappari version 0.0.15? It seems I can't help you.

Maybe you're not doing it as user:

cp /home/user/.config/scorpius/yappari.log /home/user/MyDocs

If you can't still find a log it means you have never run Yappari, or you're not running the latest one but an early version where the log was somewhere else.