circle card tutorial

I was able to successfully create the circle card from the Microsoft tutorial but then it stopped working for some reason. I tried several times to go thru the tutorial again and recreate it and it just won't work. Is the documentation outdated? Can anybody help me understand which parts needs to be tweaked to get it to work? Please advise. https://docs.microsoft.com/en-us/power-bi/developer/custom-visual-develop-tutorial