Hello @jorrflv
thanks for reporting that issue. This message was also recently reported by GuidoCram. Its probably caused by a software bug that RickCarlino mentioned in this thread:
What type and version of Farmbot are you using? Genesis 1.4?
Are you running on the newest FarmbotOS 9 .2.1?
You can manually write the axis length in the hardware settings. If you push the axis to its max position, you can read the axis length value in the controls tab.
This is just a quick workaround so you can still use the device, the devs will work on a solution as soon as the problem is identified.
CC @RickCarlino, any news on that? 