I keep getting an error message saying the page won’t load. The program then goes on to a different stage.
Is anyone else having the same issue?
Yes, it happens on all of the courses if you’re not using the app. There are extra grammar words on the app that aren’t on the website. You’ve probably completed the course if it says you have 10-15 words left, they are the extra grammar bits. You can go check out all of the levels and see that some of the levels are just grammar, and you can choose to ignore all the words on those levels and then it should say course completed, but after a while it goes back to saying 396/410 words learned, etc. Hope this helps! 
I just tried to download the App, but it was only available for French and Spanish!