What happened?

This warning indicates that dock calibration is required to ensure precise and repeatable changes of the tools.

Error name: Calibrate homing from menu

Error code: #17122 (XL)

How to fix it?

On the printer screen, navigate to LCD Menu -> Control -> Calibrations & Tests -> Dock Position Calibration to start the calibration. 

The printer will guide you through properly calibrating the position of individual tool heads on the printer. 

Refer to the linked printer setup step and the ones immediately successive for the full calibration procedure.