Hello hawk_08,
Try with this one.
The upper case on Serial should be lower case. Be aware, Processing is CASE SENSITIVE.
// Example by Tom Igoe
import processing.serial.*;
// The serial port:
Serial myPort;
// List all the available serial ports:
println(Serial.list());
// Open the port you are using at the rate you want:
myPort = new Serial(this, Serial.list()[0], 9600);
// Send a capital A out the serial port:
myPort.write(65);
import processing.serial.*;
// The serial port:
Serial myPort;
// List all the available serial ports:
println(Serial.list());
// Open the port you are using at the rate you want:
myPort = new Serial(this, Serial.list()[0], 9600);
// Send a capital A out the serial port:
myPort.write(65);
All the best