local variable 'ninenotes' referenced before assignment

[Kobe972]

I installed pianoplayer on windows 11 and imported a simple midi file. When click generate, the command line reports

Your hand span set to size-M which is 17.22 cm
(max relaxed distance between thumb and pinkie)
Reading beam 0 with 14 objects in stream.
Exception in Tkinter callback
Traceback (most recent call last):
  File "D:\Users\myhac\AppData\Local\Programs\Python\Python310\lib\tkinter\__init__.py", line 1921, in __call__
    return self.func(*args)
  File "D:\Users\myhac\AppData\Local\Programs\Python\Python310\Scripts\pianoplayer", line 83, in generateCMD
    self.rh.generate(nmeasures=self.meas.get())
  File "D:\Users\myhac\AppData\Local\Programs\Python\Python310\lib\site-packages\pianoplayer\hand.py", line 207, in generate
    self.set_fingers_positions(out, ninenotes, 0)
UnboundLocalError: local variable 'ninenotes' referenced before assignment