Could you explain me the correct way to communicate between main thread and CoroutineScope?

I am trying to load image from server to ImageView

button.setOnClickListener {
    CoroutineScope(Dispatchers.IO).launch {
        val url = mainApi.loadMyImage()              
        Picasso.with(requireContext()).load(url)
            .into(imgView)
        }
    }

And getting error for Picasso:

java.lang.IllegalStateException: Method call should happen from the main thread.

Could you explain me the correct way to communicate between main thread and CoroutineScope in my code?

When you want to change the UI, you have to do it on the main thread. So, you get data in the IO thread and then update the UI on the main thread

Here is the code:

button.setOnClickListener {
CoroutineScope(Dispatchers.IO).launch {
    val url = mainApi.loadMyImage()
    withContext(Dispatchers.Main){              
        Picasso.with(requireContext()).load(url)
            .into(imgView)
        }
    }
}