NullPointerException when trying to play sound

I'm having a simple program that plays a sound when running it.

code:

public static void main(String[] args) {
	 try {
	        AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(Main.class.getResource("ProgramAudio\\chechen.wav"));
	        Clip clip = AudioSystem.getClip();
	        clip.open(audioInputStream);
	        clip.start();
	        
	    } catch (Exception ex) {
	        ex.printStackTrace();
	    }
}

Error:

java.lang.NullPointerException
at java.base/java.util.Objects.requireNonNull(Objects.java:222)
at java.desktop/javax.sound.sampled.AudioSystem.getAudioInputStream(AudioSystem.java:1032)
at aChatProgramAudio.audio2.main(audio2.java:13)

Maybe the given directory has something to do with it but it does exists.

Some possibilities to try.

In this one, have chechen.wav in the same package folder as Main.java.

URL url = Main.class.getResource("chechen.wav");
AudioInputStream ais = AudioSystem.getAudioInputStream(url);

If your package folder structure is something like the following (where ProgramAudio is a package under src):

src/yourProgramCodePackage/Main.java
src/ProgramAudio/chechen.wav

Then the following should work, using "absolute" addressing.

URL url = Main.class.getResource("/ProgramAudio/chechen.wav");
AudioInputStream ais = AudioSystem.getAudioInputStream(url);

If you have the following folder structure, where ProgramAudio is a subfolder of the code package with Main.java in it, then the "relative" form of addressing should work.

src/yourProgramCodePackage/Main.java
src/yourProgramCodePackage/ProgramAudio/chechen.wav

URL url = Main.class.getResource("ProgramAudio/chechen.wav");
AudioInputStream ais = AudioSystem.getAudioInputStream(url);

Probably a good idea to follow convention for package names and stick with lower or camel case, e.g., programAudio if that is being used as a package name.