lerpColor not working on Processing but working on CodePen

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color fromColor,toColor,newBackColor;
void setup(){
  size(900,700); //Set canvas size 
  fromColor = color(119, 242, 232);
  toColor = color(105, 79, 255);
}

void draw(){
  background(newBackColor);
  float val = map(mouseX,0,width,0,1);
  newBackColor = lerpColor(fromColor, toColor, val);
  println(val);
}