Null pointer exception in TextView
<p>This is my layout   </p>

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
      &lt;RelativeLayout
          xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical" &gt;

          &lt;TextView 
        android:id = "@+id/postQues"
         android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Post A Question" /&gt;



          &lt;TextView

              android:id="@+id/postAnswer"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:layout_alignParentBottom="true"
              android:layout_alignParentLeft="true"
              android:layout_alignParentRight="true"
              android:text="Post Your Answer" /&gt;

          &lt;Button
              android:id="@+id/submit"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:layout_alignParentBottom="true"
              android:layout_alignParentRight="true"
              android:clickable="true"     

              android:text="Submit" /&gt;

      &lt;/RelativeLayout&gt;
</code></pre>

<p>This is my activity:</p>

<pre><code>package com.qstack.quizbox;

import roboguice.activity.RoboActivity;
import roboguice.inject.ContentView;
import roboguice.inject.InjectView;
import android.content.DialogInterface;
import android.view.View.OnClickListener;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import com.app.main.R;


@ContentView(R.layout.q_box)
public class QuizBox extends RoboActivity {

    @InjectView(R.id.postQues) TextView postQues;
    @InjectView(R.id.postAnswer) EditText postAnswer;
    //@InjectView(R.id.submit) Button submitA;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);

        PostQuestion postQuestion = new PostQuestion();
        postQues.setText(postQuestion.postQuestion());


        submitA.setOnClickListener(submitAnswerListener);


    }

     private OnClickListener submitAnswerListener = new OnClickListener() {
         //onClick view

         public void onClick(View v) {

             String answer;

             answer = postA.getText().toString();

             CheckAnswer checkAnswer = new CheckAnswer();

             if (answer == checkAnswer.checkAnswer())
             {
                 postA.setText("Correct");

             }


         }

     };
}
</code></pre>

<p>I am getting a null pointer exception at line number 48, caused because postQues = null. When I remove postAnswer from the code, there is no null pointer exception. I've cleaned my project and all that. Any help</p>
