line 119, in changeVolumeThread : pygame.error: mixer not initialized

[jeremystevens]

on application startup you get the following error:

pygame.error: mixer not initialized

Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python3.9/tkinter/__init__.py", line 1892, in __call__
    return self.func(*args)
  File "/home/nitestryker/github/pymusic/pymusic.py", line 119, in changeVolumeThread
    pygame.mixer.music.set_volume(float(value) / 100)
pygame.error: mixer not initialized