void setup(){
  size(1024, 768, OPENGL);
 
  //Serial communocation with Arduino
    try{
    println(Serial.list());
    myPort = new Serial(this, Serial.list()[1], 19200);
    println("xxxxx");
  } catch (PortInUseException e) {
    println("mouse_Mode");
    mouseMode = true;
  }
}

wrting above code like

processing error message is : cannot find a class or type named

and

catch (Exception e)  wirting like this

processing error message is :

gnu.io.PortInUseException: Unknown Application
    at gnu.io.CommPortIdentifier.open(CommPortIdentifier.java:354)
    at processing.serial.Serial.<init>(Serial.java:139)
    at processing.serial.Serial.<init>(Serial.java:105)
    at guroro_townFestival_Test_hpd.setup(guroro_townFestival_Test_hpd.java:121)
    at processing.core.PApplet.handleDraw(PApplet.java:1571)
    at processing.core.PApplet.run(PApplet.java:1496)
    at java.lang.Thread.run(Thread.java:613)

What is the problems? help me, thanks. ~