About nullpointerexception

import ddf.minim.*;//importing the minimal library 
Declaration of Minim;//Minim variable
AudioPlayer player;//Variables for storing sound data
inti;
import com.onformative.leap.LeapMotionP5;
import com.leapmotion.leap.Finger;

AudioPlayer loopSound;
float x,y;
LeapMotionP5leap;

void setup() {

    minimum = new Minimum(this); // initializing minimum
    player=minim.loadFile("piano14.mp3");
    leap = new LeapMotionP5(this);
    /*
    ↑ Load audio data, read as many as you want, or collectively.
    I don't know how to do it, but if it gets longer, will it be okay?
    Ask Mr. Google.

    Also, if you want to configure more than one player, add serial numbers to the player.
    e.g.)
    player1=minim.loadFile("○○○.mp3"); 
    player2=minim.loadFile("□□□.mp3"); 
    player3=minim.loadFile("△△△.mp3"); 
    */

    ColorMode(RGB,256);// Color Mode: Well, RGB is fine.
    size (800,600); // Campus size: preference
    Background (240, 240, 240); // Background color: Maybe the image is better?

}

void draw() {

    for (i=0; i<10;i++)
        /*
        ↑ The initial value of i is 0, and when i is lower than 10, i is +1 for each description.

        ↓ All of the following numbers are appropriate.Please change it according to the UI.
        */
    {
        Fill(30,30,30); // Color the ↓ squares
        rect(10,10+100*i,100,40);//Square description
        rect(150,55+100*i,100,40);
        rect(290,10+100*i,100,40);
        rect (430,55+100*i,100,40);
        rect(570,10+100*i,100,40);
        rect (710,55+100*i,100,40);
        for (Finger finger:leap.getFingerList()) {
            PVector fingerPos=leap.getTip(finger);
            else(fingerPos.x,fingerPos.y,10,10); 
            if(fingerPos.x>10&fingerPos.x<110&fingerPos.y>10+100*i&fingerPos.y<50+100*i)
                /*
                ↑
                ·Convert mouseX, mouseY to coordinates taken by leap motion
                "·If you use a ""variable"" like i, it is difficult to change the sound for each square."
                　It can be difficult.It might work out after trial and error (lol).
                */
            {
                fill (150, 150, 150);
                rect(10,10+100*i,100,40);
                /*
                ↑
                Only when the mouse cursor (=the coordinates of the fingertips obtained by leaping) comes to the specified position.
                Overwrite fill and rect.
                */
                player.play();
                /*
                Make a sound here. If you serialize it, change the player to distinguish it.
                */
            }
        }
    }
}

void stop()
{
    player.close();// Exit sound data
    minimum.stop();
    super.stop();
}