Hi friends,
It seems I have found the error. I need to choose Edit => set target of "Trainees". That is with the sample project that mendix provides in the next lecture. As for my project, it doesn't work. But okay, it takes more time, because maybe one step earlier I was wrong.
Thank you!
to set up default homepage >click select >you can choose home_web page from myfirstappmodule Alternatively you can create your homepage and link it