Android : Simplest layout thing driving me crazy

I've a TextView inside a CardView. Now the problem is when I use setText method on the TextView it's giving me nullPointerException. According to my tests textViewAuthor in the below code is null even after initializing it. Weird part is textViewName which is initialized the same way is not null. Why is it staying null even after assigning a view?

...
textViewName = (TextView)v.findViewById(R.id.textViewName);     //not null
textViewAuthor = (TextView)v.findViewById(R.id.textViewAuthor); //NULL !!

if(textViewName == null)
    Log.e("textViewName","null");
if(textViewAuthor == null)
    Log.e("textViewAuthor","null");

Log.i("NAME", ebookName[position]);        //not null
Log.i("AUTHOR", ebookAuthor[position]);    //not null

holder.textViewName.setText(ebookName[position]);
holder.textViewAuthor.setText(ebookAuthor[position]);
...

Here's my layout code:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:weightSum="1">

    <android.support.v7.widget.CardView
        android:id="@+id/card_view"
        android:layout_gravity="center"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:clickable="true"
        android:layout_weight="0.25">

        <LinearLayout
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:padding="2dp">

            <TextView
                android:id="@+id/textViewName"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textAppearance="?android:attr/textAppearanceLarge"
                android:layout_margin="2dp" />

            <TextView
                android:id="@+id/textViewAuthor"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textAppearance="?android:attr/textAppearanceMedium"
                android:layout_margin="2dp" />

        </LinearLayout>
    </android.support.v7.widget.CardView>

</LinearLayout>