Kotlin Android One button works but other doesn't button1 is working perfectly fine but on clicking button, it crashes my app. Why is it happening? val button:Button=findViewById(R.id.signUp) val button1:Button=findViewById(R.id.logIn) button.setOnClickListener{ val intent1 = Intent(this,SignUpPage::class.java) startActivity(intent1) } button1.setOnClickListener { val intent2 = Intent(this,Welcome::class.java) startActivity(intent2) }