Need help programming double solenoids!

[Zalmay]

I am a member of team 4528, the Automatons. I need help figuring out why my pneumatics code for double solenoids won't work.

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.