[KOTLIN] Catch errore in AsyncTask (Android)

[ciucciatiilcalzino]

Ciao a tutti,
sto iniziando a studiare kotlin per realizzare applicazioni android

Oggi sto cercando di collegarmi ad un API per prendere delle informazioni
L'api é gratuita.
Per il codice ho seguito un tutorial ma purtroppo non capisco l'errore, perché nonostante abbia messo un infinita di breakpoint come richiama il metodo asincorono va in errore

package com.test.apimeteo


import android.os.AsyncTask
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.view.View
import kotlinx.android.synthetic.main.activity_main.*
import org.json.JSONObject
import java.io.BufferedReader
import java.io.InputStream
import java.io.InputStreamReader
import java.lang.Exception
import java.net.HttpURLConnection
import java.net.URL
import kotlin.math.log


class MainActivity : AppCompatActivity() {


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
    }


    fun GetSunset(view: View){


        val appid="19cfcc9079d94b33fc8c188b4b5bb622"
        var city = "london" //txtCity2.text.toString()
        val url = "https://api.openweathermap.org/data/2.5/weather?q=$city&appid=$appid"
        MyAsyncTask().execute(url)
    }


    inner class MyAsyncTask: AsyncTask<String, String, String>() {
        override fun doInBackground(vararg params: String?): String {
            try {
                var url = URL(params[0])
                var urlConnect =  url.openConnection() as HttpURLConnection
                urlConnect.connectTimeout =7000


                var inString = ConvertStreamToString(urlConnect.inputStream)
                //txtResult
                publishProgress(inString)
            }
            catch (ex: Exception)
            {
             Log.e("ERRORMyAsyncTask", ex.message.toString())




            }


                return " "
        }


        override fun onPreExecute() {
            //
        }


        override fun onProgressUpdate(vararg values: String?) {
          //  super.onProgressUpdate(*values)
            try {
                var json = JSONObject(values[0])
                var coord = json.getJSONObject("coord")
                var meteo = coord.getJSONObject("results")
                var description = meteo.getJSONObject("description")


                txtResult.text ="" +description




            }
            catch (ex: Exception){
                Log.e("ERRORonProgressUpdate", ex.message.toString())
            }
        }


        override fun onPostExecute(result: String?) {


            //after task done
        }




    }


    fun ConvertStreamToString(inputStream: InputStream):String {
        val bufferReader = BufferedReader(InputStreamReader(inputStream))
        var line: String
        var allString:String=""
        try {
            do {


                line= bufferReader.readLine()
                if ( line != null){
                    allString += line
                }
            }while ( line != null)
            inputStream.close()
        }
        catch (ex: Exception)
        {
            Log.e("ERRORConvertStreamTo", ex.message.toString())


        }


        return allString
    }

}

praticamente io arrivo a MyAsyncTask().execute(url)
e mi va in errore finendo direttamente qui

public void onClick(@NonNull View v) {
    if (mResolvedMethod == null) {
        resolveMethod(mHostView.getContext(), mMethodName);
}

    try {
        mResolvedMethod.invoke(mResolvedContext, v);
} catch (IllegalAccessException e) {
        throw new IllegalStateException(
                "Could not execute non-public method for android:onClick", e);
} catch (InvocationTargetException e) {
        throw new IllegalStateException(
                "Could not execute method for android:onClick", e);
}
}

nella classe AppCompatViewInflater di androidx.appcompat.app;

Sapete darmi qualche suggerimento per intercettare l'errore o dove ho sbagliato?
Grazie