Image crashes from application

I am using the Android Sutdio navigation fragment template. I added ImageView to fragment_main.xml file as follows

<ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/imageView"
        android:src="@drawable/at"
        android:layout_below="@+id/section_label"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="80dp" />

      

        
        
        
      

    

And the java code looks like this In the OnCreate method.

img = (ImageView)findViewById(R.id.imageView);

      

        
        
        
      

    

In the attached method section.

img.setImageResource(R.drawable.at);

      

        
        
        
      

    

Every time I run this code it crashes. If the image source is set to XML it works very well, but when I use a java file to change the image source. It crashes stating that the "Sorry" application has stopped. Image details, if necessary Image size: 32.3 kb Dimensions: 450 * 432 pixels