oops and pwm errors...

OSError: [Errno 22] Invalid argument

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/debian/Motter/RandomCodes/./PWM_PWM.py", line 9, in <module>
    LED = Pwm('/dev/bone/pwm/1/b', frequency=1000)
  File "/home/debian/Motter/RandomCodes/PWM.py", line 23, in __init__
    self.configure( **kwargs )
  File "/home/debian/Motter/RandomCodes/PWM.py", line 76, in configure
    (self.path/'period').write_text( str( period ) )
  File "/usr/lib/python3.9/pathlib.py", line 1275, in write_text
    return f.write(data)
OSError: [Errno 22] Invalid argument