FTC NullPointerException

[dajp999]

I am a new FTC coach and I am trying to learn Java to support out team. I created 2 classes one which will act as coordinating class which extends OpMode and for now a class representing the RobotDrive. I have done a fair amount of testing and debugging including verifying names of devices in the config file but I still receive a NullPointerException. What am I doing wrong?!?!?!

Here are the 2 classes:

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package com.qualcomm.ftcrobotcontroller.opmodes;


import com.qualcomm.robotcore.eventloop.opmode.OpMode;

public class Brain extends OpMode {

private int statusDriveInteger = 76;

private RobotDrive rd = new RobotDrive();



public void init (){

statusDriveInteger = rd.statusRobotDrive(1);

telemetry.addData("here ",statusDriveInteger);
}

public void loop (){
rd.setPowerLeftRearDrive(1.0);

}

}





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package com.qualcomm.ftcrobotcontroller.opmodes;


import com.qualcomm.robotcore.hardware.DcMotor;
import com.qualcomm.robotcore.hardware.HardwareMap;




public class RobotDrive {

int erroroccurred;
DcMotor h_leftRearDrive;
private HardwareMap rd_hardwareMap = null;




public int statusRobotDrive (double p_leftRearDrive){
try {
h_leftRearDrive = rd_hardwareMap.dcMotor.get("1");
} catch (Exception p_exception) {
h_leftRearDrive = null;
erroroccurred = 102;

}


return erroroccurred;



}


public void setPowerLeftRearDrive (double p_leftRearDrivePower) {
h_leftRearDrive.setPower(p_leftRearDrivePower);
}

}