I just started Kivy and I’m using a mix of Kivy and KivyMD. I made a simple button that is in a seperate file and class and added it to my main class. it is suppose to just print ‘WORKS’ but it don’t.

This is my main.py:

from kivymd.app import MDApp
from kivymd.uix.screen import MDScreen
from audio_player import AudioPlayer

class Demo(MDApp):
    def build(self):
        screen = MDScreen()
        player = AudioPlayer()
        

        btn = player.playerBTN()

        screen.add_widget(btn)

        return screen
    

if __name__ == '__main__':
    Demo().run()

And this is the button file located in audio_player.py:

from kivymd.uix.button import MDRectangleFlatButton
from kivy.core.audio import SoundLoader

class AudioPlayer():

    def playerBTN(self, xPos=0.5, yPos=0.3):    
        return MDRectangleFlatButton(text='X', pos_hint={
                                    'center_x': xPos, 'center_y': yPos},
                                    on_release=self.btnfunc)
    
    def btnfunc(self, obj):
        print('WORKS')

And when I click on the button, nothing happends. No error, no statement.
I tried solving this for too long but it is probably something dumb. If anyone can help I would be grateful. Thanks!