Set servo to zero python script not working

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I'm on this page of the instructions, and I'm getting the following error when I run $sudo python3 servo_zeroing.py

Set servo to zero
Traceback (most recent call last):
File "servo_zeroing.py", line 14, in
Servo(pin).angle(10)
File "/usr/local/lib/python3.7/dist-packages/robot_hat-1.0.4-py3.7.egg/robot_hat/servo.py", line 12, in init
self.pwm.period(4095)
AttributeError: 'str' object has no attribute 'period'