Hi there!

It might be a GPIO-related issue. Please refer to FAQ1 - Q1: "Why does running python3 ~/x735-script/read_fan_speed.py get errors?" https://wiki.geekworm.com/X735-script#FAQ

We highly recommend that you click the link in the answer to view more details and solutions—this is essential for resolving the problem: https://github.com/raspberrypi/linux/issues/6037.