Android application (webview) does not open local html pages from asset (android studio), what's the problem?

Question

Android

Android application (webview) does not open local html pages from asset (android studio), what's the problem?
First, it normally opens the first index.html page in which there is a link to another (local from asset) file. When you click on it, the application stupidly closes showing a system failure. I did everything as in this video Here are the screenshots

Answer 1

In this video https://www.youtube.com/watch?v=FFSD8y7nQvc
you can see how to create links to other pages in assets