Chief Delphi - Need help programming double solenoids!

I am a member of team 4528, the Automatons. I need help figuring out why my pneumatics code for double solenoids won't work.
Code:
package org.usfirst.frc.team4528.robot;



import edu.wpi.first.wpilibj.Compressor;                //Pneumatics

import edu.wpi.first.wpilibj.Joystick;                        //DriveTrain

import edu.wpi.first.wpilibj.RobotDrive;                //DriveTrain

import edu.wpi.first.wpilibj.SampleRobot;                

import edu.wpi.first.wpilibj.DoubleSolenoid;                //Pneumatics

import edu.wpi.first.wpilibj.Timer;                                

import edu.wpi.first.wpilibj.Victor;                        //Motors



public class Robot15 extends SampleRobot

{

        Victor frontLeft;

        Victor rearLeft;

        Victor frontRight;

        Victor rearRight;

        Victor pully;



        RobotDrive myRobot;

        XBoxJoystick gamestick;



        DoubleSolenoid pistonArm;

        Compressor compressor;



        public void Robot()

        {

                

                frontLeft = new Victor(1);        //Set to appropriate PWM port

                rearLeft = new Victor(2);        //Set to appropriate PWM port

                frontRight = new Victor(3);        //Set to appropriate PWM port

                rearRight = new Victor(4);        //Set to appropriate PWM port

                pully = new Victor(5);                //Set to appropriate PWM port



                pistonArm = new DoubleSolenoid(7, 6);

                compressor = new Compressor();        //Set to null



                gamestick = new XBoxJoystick(0);        //Set to appropriate victors

                myRobot = new RobotDrive(frontLeft, rearLeft, frontRight, rearRight);

        }



        public void useElavator()

        {

                if(gamestick.getRightZ() > 0)

                {

                        pully.set(gamestick.getRightZ());        //Sets value of trigger to speed of motor

                }

                else if(gamestick.getLeftZ() > 0)

                {

                        pully.set(-gamestick.getLeftZ());        //Sets value of trigger to speed of motor

                }

                else

                {

                        pully.set(0.0);                                //Doesn't run if trigger not pressed

                }

        }

        

        public void moveArm()

        {

                compressor.start();

                compressor.setClosedLoopControl(true);        //Lets PCM handle the automatic turning on and off of compressor once pressure hits 120 psi

                

                if(gamestick.getAButton() == true)

                {

                        pistonArm.set(DoubleSolenoid.Value.kForward);        //Pushes piston whenever 'A' button is pressed

                        System.out.println("'A' button is pressed: Piston moves forward");

                }

                else if(gamestick.getBButton() == true)

                {

                        pistonArm.set(DoubleSolenoid.Value.kReverse); //Reverses piston  whenever 'B' button is pressed

        

                        System.out.println("'B' button is pressed: Piston moves backward");

                }

                else

                {

                        pistonArm.set(DoubleSolenoid.Value.kOff);                //Disables piston

                }

        }



        public void operatorControl()

        {

                myRobot.setSafetyEnabled(false);

                while(isOperatorControl() && isEnabled())

                {

                        //squaredInputs help to lower speed value of analog sticks at lower values

                        myRobot.tankDrive(gamestick.getLeftY(), gamestick.getRightY(), true);

                        Timer.delay(0.005);

                        useElavator();

                        Timer.delay(0.005);

                        moveArm();

                }

        }

}
We know that the problem is not with the hardware itself since we are able to use the pistons manually via the solenoid. It is most likely a problem with the code, specifically the moveArm() method.