@vikasjee you should post your entire sketch... put between three backticks (the character left of your "1" key on you keyboard <three backticks> your code <three backticks>

@bluman If it is the ? operator that is the fuzzy one then you can rewrite the statement like: if (message.getBool()) digitalWrite(message.sensor-1+RELAY_1, true); else digitalWrite(message.sensor-1+RELAY_1, false); The ? operator act like: expression?truepart:falsepart So if expression is true the it executes the truepart else it executes the falsepart

I commented out the avr/progmem.h include line and it compiled correctly and appears to be working now plugged back into the Vera USB port.