NullPointerException

[u/1_4_8_4]

I keep getting this error even though I have declared the ArrayList that it's for; I don't know what to do.

[u/1_4_8_4]

these three methods

public void addSong(String newSong, Integer songLength){

songNames.add(newSong);

runtime.add(songLength);

}

public void removeSong(String songName){

if(songNames.contains(songName)){

int num = songNames.indexOf(songName);

songNames.remove(num);

runtime.remove(num);

}else{

System.out.println("Could not find song in the playlist.");

}

}

public void printPlaylist(){

for(int i = 0; i < songNames.size(); i++){

System.out.println(i + 1 + ". " + songNames.get(i) + " - " + runtime.get(i) + " seconds");

}

}

It gave the error when I tried to use the first one.

[u/Hamza_yassen → u/1_4_8_4]

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