<Why is my android app just crashing when I run it...

# stackoverflow

[user]

Why is my android app just crashing when I run it?
Why is my app just crashing?
It is supposed to be a training app that gives you instructions via multiple pages.
But it is throwing this error in the console when i run it on my phone and on my virtual phone.
These are the files that are in my project.
Please help.

E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.hectorwithc.training_handbook, PID: 7400
java.lang.RuntimeException: Unable to instantiate activity...