Shuffling audio files in Minim on a pi Zero

Processing for Pi
1

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Hi
I am trying to randomly play audio files on a pi zero (yes you can play back audio files on a pi zero, as demonstrated here ) and do a few other things. It’s for an art installation that is located in multiple places all at once (hence I need to keep the micro controller price as low as possible).
I’ve applied @kfrajer 's code (via @ charmypatel) shuffle song code and it works beautifully (thanks for that piece of code btw). That is … as long as I play it on my laptop… On the pi, after three files (these are short mp3, under 3 min long) I start getting the:

Blockquote

Null pointer exception
=== JavaSound Mhinim Error ===
=== Unable to return a SourceDataLine: unsuported format - PCM_SIGNED 8000.0 Hz, mono, 2 bytes/frame, little-endian

=== Minim Error ===
=== Couldn’t load the file 1.mp3 error message.

However if I simply play back an audio file, even a large .wav file I don’t get that error message. Hence I am thinking that the pi gets overloaded when I shuffle the files?
I was wondering if there was another way of loading the files, or perhaps having multiple players and then randomizing (shuffling) the players instead of the files? I am not too sure how to go about this. I have tried using arrays to randomize the players but that does not work as players are not objects.
Anybody has any idea? I noticed @bluemoon proposed somewhat of a fix to a similar problem, but nobody confirmed whether it worked or not, hence I am thinking it probably did not … ?
I’m pasting my code down here so you can all see (I did not modify @kfrajer’s code, I just inserted it into a series of if statement; as you will see):

import processing.io.*;
import ddf.minim.*;
Minim minim;
AudioPlayer player;
boolean playeurInit = false;// que leplayer n'est pas lancé
boolean stop = true;
StringList tableau;
int current=0;

// GPIO numbers refer to different phyiscal pins on various boards
// On the Raspberry Pi GPIO 4 is physical pin 7 on the header

//Thanks to kfrajer (via charmypatel) for the shuffle code

void setup() {
  // INPUT_PULLUP enables the built-in pull-up resistor for this pin
  // left alone, the pin will read as HIGH
  // connected to ground (via e.g. a button or switch) it will read LOW
  GPIO.pinMode(05, GPIO.INPUT_PULLUP);

  size(100, 100);
  minim = new Minim(this);
  //ADD sound files to your list
  tableau=new StringList();
  tableau.append("1.mp3");
  tableau.append("2.mp3");
   tableau.append("3.mp3");
 
  shufflePlayList();
  String son = tableau.get(current++);
  println(son);
  player = minim.loadFile(son);
  player.pause();
}
  
  
  void draw()
 {
    if (GPIO.digitalRead(05) == GPIO.HIGH)
  {
  // sensor picks up movement
    fill(255);
    
     if (!stop) {
 
    if (player.isPlaying() == false) {
 
      //CHECK we haven't exhausted the current shuffled(random) play list
      //If we have played all the songs, then re-shuffle the list
      if (current==tableau.size()-1) {
        shufflePlayList();
       }
    
     String son = tableau.get(current++);
      player = minim.loadFile(son);
      player.play();
      playeurInit = true;
         }
      }
     }
   }

if (GPIO.digitalRead(05) == GPIO.LOW)
    {
      // sensor picks up no movement
    fill(204);
    //player.pause();
    
    {
      fill(204);
    
      }
    }
   stroke(255);
  ellipse(width/2, height/2, width*0.75, height*0.75);
  
 }
 
 void mousePressed() 
 {
    if (stop == true) {
      stop = false;
    } else {
    stop = true;
    if (player.isPlaying() == true ) {
      player.pause();
          }
        }
 }
void stop()
{
  player.close();
  minim.stop();
  super.stop();
}
 void shufflePlayList() {
  current=0;
  tableau.shuffle();
 }