Just installed the app today and I’ve already run into an issue. It worked fine for a while, but now the dashboard just says that there’s an unknown error and it was last updated however long ago since it worked. It shows zero lessons or reviews, but they show when you actually click on the section. The dashboard never updates. Force closing and/or restarting doesn’t fix it. I’m using a Samsung Tab 4.
Probably best to find the thread for that specific app. The apps are unofficial, third-party apps, but if they are still active the creators are usually pretty responsive.
Here’s the category for apps