Unable to load sound in Android

Hey all!

I have gone through every topic on the subject and tried every example, but I always get the exception message and sound fails to load. I have tried the go-to example:

import android.media.MediaPlayer;
import android.content.res.AssetFileDescriptor;
import android.content.Context;
import android.app.Activity;

/////////////////////////////////////////////////////////

MediaPlayer mp;
Context context;
Activity act;
AssetFileDescriptor afd;

void setup() {
  act = this.getActivity();
  context = act.getApplicationContext();
  try {
    mp = new MediaPlayer();
    afd = context.getAssets().openFd("MYSOUND.mp3");//which is in the data folder
    mp.setDataSource(afd.getFileDescriptor());
    mp.prepare();
  }
  catch(IOException e) {
    println("file did not load");
  }
  mp.start();
};

void draw() {
};

As well as the more complex examples:

import java.io.File;
                import java.io.IOException;
                import android.media.MediaPlayer;
                import android.media.MediaPlayer.OnPreparedListener;
                import android.content.res.AssetFileDescriptor;
                import  android.content.res.Resources;
               import android.content.res.AssetManager;
                 import android.content.Context;
        import android.app.Activity;
        import android.os.Bundle;
        import android.app.Application;

        /////////////////////////////////////////////////////////

        MediaPlayer mp;
        public boolean loop = true;
        AssetManager am;
     Context context;
     boolean premiere = false;

     Activity act;
     AssetFileDescriptor afd;
     boolean AppliAndroid = false;


     public   void setup(){
          orientation(PORTRAIT);
          background(255,0,0);
          fill(255);
          textSize(24);
          text("SONG IS PLAYING", 200,300);
          act = this.getActivity();
       context = act.getApplicationContext();
      // testClass();




       try {
          mp = new MediaPlayer();

        afd = context.getAssets().openFd("MYSOUND.mp3");//which is in the data folder
      mp.setDataSource(afd.getFileDescriptor());
      mp.prepare();
      } catch(IOException e) {
        println("j'arrive pas à préparer");
        }
         mp.setLooping(loop);
          mp.start();


       };

    public    void draw(){

        };

Sound just refuses to load. I get the exception message every time.