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Android Build a Self-Destructing Message Android App Retrieving and Viewing Messages Creating a Custom List Adapter for Messages

After implementing this code there is no error but when i'm logging into it my application is getting crashed.

public class MessageAdapter extends ArrayAdapter<ParseObject> {

protected Context mContext;
protected List<ParseObject> mMessages;


public MessageAdapter(Context context,List<ParseObject> messages) {

    super(context,R.layout.message_item,messages);
    mContext = context;
    mMessages = messages;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
  ViewHolder holder;


    if (convertView == null) {


        convertView = LayoutInflater.from(mContext).inflate(R.layout.message_item, null);
        holder = new ViewHolder();
        holder.iconImageView = (ImageView) convertView.findViewById(R.id.Messageicon);
        holder.namelabel = (TextView) convertView.findViewById(R.id.Senderlabel);
        convertView.setTag(holder);
    }
    else {
        holder = (ViewHolder)convertView.getTag();
    }

    ParseObject message = mMessages.get(position);

    if (message.getString(ParseConstants.KEY_FILE_TYPE).equals(ParseConstants.TYPE_IMAGE)) {
        holder.iconImageView.setImageResource(R.drawable.pic);
    }
    else {
       holder.iconImageView.setImageResource(R.drawable.play);
    }

    holder.namelabel.setText(message.getString(ParseConstants.KEY_SENDER_NAME));
    return convertView;
}

private static class  ViewHolder{
    ImageView iconImageView;
    TextView namelabel;

}

}