Thanks for the hint. Will look at it and add a #if to solve problem. Until then just delete that line.

#if false && UI_DISPLAY_RW_PIN >= 0 // not really needed

#if false && UI_DISPLAY_RW_PIN >= 0 // not really needed

#ifndef _CustomEvents_H

#if defined(CUSTOM_EVENTS)

#if NONLINEAR_SYSTEM

#ifdef DEBUG_SPLIT

#ifdef Z_PROBE_RUN_AFTER_EVERY_PROBE

#ifndef SDSUPPORT  // Some boards have sd support on board. These define the values already in pins.h

#ifndef CONFIGURATION_H

#ifndef CONFIGURATION_H

#if EXTRUDER_JAM_CONTROL

#if defined(ENABLE_POWER_ON_STARTUP) && ENABLE_POWER_ON_STARTUP && (PS_ON_PIN>-1)

#if defined(PS_ON_PIN) && PS_ON_PIN>-1

Next, I edited the ui.h file. Near the bottom you'll find: #if FEATURE_CONTROLLER == CONTROLLER_VIKI2, followed by several motherboard pinouts. The first motherboard is Azteeg X3. Change it to read li

#if NUM_TEMPERATURE_LOOPS > 0

#ifndef CONFIGURATION_H

for clarity.  the replacement code is from line 320 in motion.h to 360:#if MULTI_ZENDSTOP_HOMING

#if MULTI_ZENDSTOP_HOMING

#if DISTORTION_CORRECTION