first of all, thank you for providing this great service! I am still amazed by the sheer customizabllity offered here!
Now to my question: On the dashboard I can see the current original lesson of this month (Health / けんこう). When I click "Study" on any of its items, I am prompted for the question style (where flashcards is auto-selected). When I click "Start quiz" I get this error message: "Sorry, you need to select at least one group of materials to study."
Also, when I click on one of the items for example "Staying healthy" it says "Sorry, but no terms could be found." on the next page.