Blank error when generating axioms in a blank ontology

[vishnukozhipara98]

[hugoredinho]

I know this is way later, but I had the same problem and managed to fix it, so hope this helps people in the future. The problem has nothing to do with the ontology, it's the sheet name. It's trying to pull from "Worksheet" but that sheet doesn't exist. You need to change that value to the name of the xlsx you're currently using. So the correct name would be "[..]sework_data_pizza_500 (1)". You can also just do "add" to create a new rule, copy the correct name, and then paste it on all the rules.