The printer displaying the message: Moving the tower failed. Make sure there is no obstacle in its path and repeat the action.
Error name: Tower moving failed
Error code: #10103
Issued when the printer has attempted to home the tower but has found resistance to move it.
Make sure that the latest firmware is installed. Check if the three screws indicated in the pictures below are tightened and not moving.
See if there is nothing physically blocking the movement of the tower. In case you cannot find anything blocking it, add a small amount of super lube on the trapezoidal rod.