07-3 binding syntax error

class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)

val binding = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)

binding.button.setOnClickListener {
binding.button.visibility = View.INVISIBLE    // binding. 추가
binding.imageView.visibility = View.VISIBLE
}

binding.imageView.setOnClickListener {
binding.button.visibility = View.VISIBLE
binding.imageView.visibility = View.INVISIBLE
}

// setContentView(R.layout.activity_main)

}
}