I dont know what board makes the error occurs. i have tree arduinos megas connected i show you a screenshot of the tree .mfmc files.
I try to make a OVERHEAD panel. everything work fine until the config error.
ARDUINO 1
<?xml version="1.0" encoding="utf-8"?>
<Config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<ModuleName />
<PowerSavingTime>600</PowerSavingTime>
<Button Name="Bateria" Pin="3" />
<Output Name="Drive 1" Pin="2" />
<Output Name="Drive2" Pin="4" />
<Button Name="Apu Start" Pin="6" />
<Button Name="Apu OFF" Pin="5" />
<Output Name="Bat Discharge" Pin="7" />
<Output Name="TR Unit" Pin="8" />
<Output Name="ELEC" Pin="9" />
<Button Name="DC Selector Standby" Pin="10" />
<Button Name="DC Selector BAT" Pin="11" />
<Button Name="AC Selector Standby" Pin="12" />
<Button Name="AC Selector GNDPWR" Pin="13" />
<Button Name="AC Selector GEN1" Pin="14" />
<Button Name="AC Selector APU GEN" Pin="15" />
<Button Name="AC Selector GEN2" Pin="16" />
<Button Name="GRDPWR ON" Pin="17" />
<Button Name="GRDPWR OFF" Pin="18" />
<Output Name="GRDPWR Avaliable" Pin="19" />
<Output Name="TRANSFER BUS OFF" Pin="20" />
<Output Name="Source OFF 1" Pin="21" />
<Output Name="Source OFF 2" Pin="22" />
<Output Name="GEN OFF BUS 1" Pin="23" />
<Output Name="GEN OFF BUS 2" Pin="24" />
<Output Name="APUGEN OFF BUS" Pin="25" />
<Button Name="GEN1 ON" Pin="26" />
<Button Name="GEN1 OFF" Pin="27" />
<Button Name="GEN2 ON" Pin="28" />
<Button Name="GEN2 OFF" Pin="29" />
<Button Name="APU GEN1 ON" Pin="30" />
<Button Name="APU GEN1 OFF" Pin="31" />
<Button Name="APU GEN2 ON" Pin="32" />
<Button Name="APU GEN2 OFF" Pin="33" />
<Button Name="WIPER LEFT park" Pin="34" />
<Button Name="WIPER LEFT int" Pin="35" />
<Servo Name="APU Gauge Servo" DataPin="46" />
<Output Name="Stanby Power Off" Pin="36" />
<Output Name="APU MAINT" Pin="37" />
<Output Name="APU LOW OIL PRESS" Pin="38" />
<Output Name="APU FAULT" Pin="39" />
<Output Name="APU OVER SPEED" Pin="40" />
<Button Name="BUS TRANFER" Pin="44" />
<Button Name="STANDBY POWER BAT" Pin="41" />
<Button Name="STANDBY POWER AUTO" Pin="42" />
<Servo Name="ENGINE SERVO" DataPin="49" />
<Output Name="TRANSFER BUS OFF 2" Pin="47" />
<Button Name="CROSSFEED" Pin="45" />
<Button Name="IGN SEL LEFT" Pin="43" />
<Button Name="IGN SEL RIGHT" Pin="53" />
<Button Name="DRIVE 1" Pin="50" />
<Button Name="DRIVE 2" Pin="51" />
</Config>
ARDUINO 2
<?xml version="1.0" encoding="utf-8"?>
<Config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<ModuleName />
<PowerSavingTime>600</PowerSavingTime>
<Button Name="FUEL PUMP L AFT" Pin="2" />
<Button Name="FUEL PUMP L FWD" Pin="3" />
<Button Name="FUEL PUMP R FWD" Pin="4" />
<Button Name="FUEL PUMP R AFT" Pin="5" />
<Output Name="FUEL PUMP L AFTL LP" Pin="6" />
<Output Name="FUEL PUMP L FWD LP" Pin="7" />
<Output Name="FUEL PUMP R FWD LP" Pin="8" />
<Output Name="FUEL PUMP R AFT LP" Pin="9" />
<Button Name="FUEL PUMP CTR L" Pin="10" />
<Button Name="FUEL PUMP CTR R" Pin="11" />
<Output Name="FUEL PUMP CTR L LP" Pin="12" />
<Output Name="FUEL PUMP CTR R LP" Pin="13" />
<Output Name="CROSSFEED VALVE OPEN" Pin="14" />
<Output Name="FILTER BYPASS L" Pin="15" />
<Output Name="FILTER BYPASS R" Pin="16" />
<Output Name="SPAR VALV CLO L" Pin="17" />
<Output Name="SPAR VALV CLO R" Pin="18" />
<Output Name="ENGVALV CLO L" Pin="19" />
<Output Name="ENGVALV CLO R" Pin="20" />
<Button Name="LIGHT FIXED L" Pin="25" />
<Button Name="LIGHT FIXED R" Pin="26" />
<Button Name="LIGHT TAXI" Pin="29" />
<Output Name="DUAL BLEED" Pin="35" />
<Output Name="RAM DOOR L" Pin="36" />
<Output Name="RAM DOOR R" Pin="37" />
<Button Name="L RECIRC FAN" Pin="38" />
<Button Name="R RECIRC FAN" Pin="39" />
<Button Name="OVHT TEST" Pin="40" />
<Button Name="L PACK HIGH" Pin="41" />
<Button Name="L PACK OFF" Pin="42" />
<Button Name="R PACK HIGH" Pin="43" />
<Button Name="R PACK OFF" Pin="44" />
<Button Name="ISOL VALVE CLOSE" Pin="45" />
<Button Name="ISOL VALVE OPEN" Pin="46" />
<Output Name="L PACK " Pin="47" />
<Output Name="R PACK" Pin="48" />
<Output Name="L WING " Pin="49" />
<Output Name="R WING " Pin="50" />
<Output Name="L BLEED" Pin="51" />
<Output Name="R BLEED" Pin="52" />
<Output Name="DOOR" Pin="53" />
<Button Name="L RET L ON" Pin="21" />
<Button Name="L RET R ON" Pin="23" />
<Button Name="L LOGO" Pin="30" />
<Button Name="L STROBE" Pin="31" />
<Button Name="L WIN" Pin="33" />
<Button Name="L WHEEL" Pin="34" />
<Button Name="L ANTICOL" Pin="32" />
<Button Name="LTURN L" Pin="27" />
<Button Name="LTURN R" Pin="28" />
<Button Name="L R L OFF" Pin="22" />
<Button Name="L R R OFF" Pin="24" />
</Config>
ARDUINO 3
<?xml version="1.0" encoding="utf-8"?>
<Config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<ModuleName />
<PowerSavingTime>600</PowerSavingTime>
<Button Name="AIR BLEED 1" Pin="2" />
<Button Name="AIR BLEED 2" Pin="3" />
<Button Name="APU BLEED" Pin="4" />
<Button Name="ENGINE START L" Pin="5" />
<Button Name="ENGINE START R" Pin="6" />
<Button Name="EXHAUST" Pin="7" />
<Button Name="SUPPLY" Pin="8" />
<Output Name="EXHAUST OFF" Pin="9" />
<Output Name="SUPPLY OFF" Pin="10" />
<Button Name="EMER EXIT" Pin="11" />
<Output Name="NOT ARMED" Pin="12" />
<Button Name="NO SMOKING" Pin="13" />
<Button Name="FASTEN SEAT" Pin="14" />
<Button Name="ATTND CALL" Pin="15" />
<Button Name="GRND CALL" Pin="16" />
<Button Name="WIPER RIGHT INT" Pin="17" />
<Output Name="OVERHEAT L 1" Pin="18" />
<Output Name="OVERHEAT L 2" Pin="19" />
<Output Name="OVERHEAT R 1" Pin="20" />
<Output Name="OVERHEAT R 2" Pin="21" />
<Output Name="ON L1" Pin="22" />
<Output Name="ON L2" Pin="23" />
<Output Name="ON R1" Pin="24" />
<Output Name="ON R2" Pin="25" />
<Button Name="PROBE HEAT A" Pin="26" />
<Button Name="PROBE HEAT B" Pin="27" />
<Button Name="WINDOW HEAT 1" Pin="28" />
<Button Name="WINDOW HEAT 2" Pin="29" />
<Button Name="WINDOW HEAT 3" Pin="30" />
<Button Name="WINDOW HEAT 4" Pin="31" />
<Button Name="WINDOW TEST" Pin="32" />
<Output Name="CAP PITOT" Pin="33" />
<Output Name="FO PITOT" Pin="34" />
<Output Name="L ELEV PITOT" Pin="35" />
<Output Name="R ELEV PITOT" Pin="36" />
<Output Name="L ALPHA PITOT" Pin="37" />
<Output Name="R ALPHA PITOT" Pin="38" />
<Output Name="TEMP PROBE" Pin="39" />
<Output Name="AUX PITOT" Pin="40" />
<Output Name="COWL ICE L" Pin="41" />
<Output Name="COWL ICE R" Pin="42" />
<Output Name="L VALVE OPEN" Pin="43" />
<Output Name="R VALVE OPEN" Pin="44" />
<Output Name="COWL VALVE L" Pin="45" />
<Output Name="COWL VALVE R" Pin="46" />
<Button Name="WING ANTI-ICE" Pin="47" />
<Button Name="ENGINE ANTI-ICE L" Pin="48" />
<Button Name="ENGINE ANTI-ICE R" Pin="49" />
</Config>