Help with Kotlin

Question

Hello, so I made this app is really basic
It is about converting k/h to M/s and M/S to K/h
My question is what do I have wrong, it says unfortunately your app stop working

THis is the main activity

https://code.sololearn.com/WUngHn2WqcwJ/?ref=app
https://code.sololearn.com/cQzFY8BjHpIV/?ref=app

Answer 1

Thread.sleep(1000) is affecting your code b/c every code must go after super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)

Answer 2

Does it stops working if u change orientation or on some specific input...
Well this may be happening because of some error in code which emulator couldn't solve... See terminal while running you app