Chief Delphi - Any help appreciated

I have written a simple java program to test our 2016 bot. I have update the firmware, image and jre on our 2015 roborio, and updated to the latest version of Eclipse. Our drive consists of four motors – one Talon controller with a y-splitter controls the two left motors, and another Talon with a y-splitter controls the two right motors.

The bot works with a simple arcade drive coded in the teleop method. When I add the setInvertedMotors code (which worked last year), I get “no code” on the bot, a red comm light on the roborio, and the following error:

ERROR Unhandled exception: java.lang.NullPointerException at [edu.wpi.first.wpilibj.RobotDrive.setInvertedMotor( RobotDrive.java:703), org.usfirst.frc.team4951.robot.Robot.robotInit(Rob ot.java:38), edu.wpi.first.wpilibj.IterativeRobot.startCompetit ion(IterativeRobot.java:72), edu.wpi.first.wpilibj.RobotBase.main(RobotBase.jav a:241)]

Here is my code:

Code:

import edu.wpi.first.wpilibj.IterativeRobot;

import edu.wpi.first.wpilibj.smartdashboard.SendableChooser;

import edu.wpi.first.wpilibj.smartdashboard.SmartDashboard;

import edu.wpi.first.wpilibj.Joystick;

import edu.wpi.first.wpilibj.RobotDrive;

import edu.wpi.first.wpilibj.RobotDrive.MotorType;



public class Robot extends IterativeRobot {

    final String defaultAuto = "Default";

    final String customAuto = "My Auto";

    String autoSelected;

    SendableChooser chooser;

    

    RobotDrive myDrive;

    Joystick stick0, stick1;

        

    public void robotInit() {

        chooser = new SendableChooser();

        chooser.addDefault("Default Auto", defaultAuto);

        chooser.addObject("My Auto", customAuto);

        SmartDashboard.putData("Auto choices", chooser);

        

        myDrive = new RobotDrive(0,1); // 0 = left, 1 = right



        stick0 = new Joystick(0);

        stick1 = new Joystick(1);

        

        myDrive.setInvertedMotor(MotorType.kFrontLeft, true);

        myDrive.setInvertedMotor(MotorType.kRearLeft, true);

        

    }

    

    public void autonomousInit() {

            //autoSelected = (String) chooser.getSelected();

//                autoSelected = Smart;Dashboard.getString("Auto Selector", defaultAuto);

                //System.out.println("Auto selected: " + autoSelected);

    }



    public void autonomousPeriodic() {

            switch(autoSelected) {

            case customAuto:

        //Put custom auto code here   

            break;

            case defaultAuto:

            default:

            //Put default auto code here

            break;

            }

    }



    public void teleopPeriodic() {

        myDrive.arcadeDrive(stick0);

    }



    public void testPeriodic() {

    

    } 

}

Any help with the error would be appreciated. Thanks.