The touch screen or Fluidd displays the error message:
Unable to parse option rotation_distance in section stepper

The number of motor rotation steps in the configuration file is modified incorrectly.
The rotation step value has unrecognised characters, such as a comma.
Refer to Web Page Control and connect the printer to Fluidd.
Enter into the backend via Fluidd.
Delete any special characters of the rotation distance value except decimal points.
For example:

For the Neptune 4 and Neptune 4 Pro, refer to the guide below to update motherboard firmware and touch screen firmware.
How to update the motherboard firmware and the touch screen firmware
For the Neptune 4 Plus and Neptune 4 Max, refer to the guide below to update motherboard firmware and touch screen firmware.
How to use the motherboard firmware and touch screen firmware