How to Solve Notice: Undefined index: highlighted in include() in drupal 7?

To solve this error/notice need to follow below steps.

1. If you have created any block or region need to check the block/region name in .info file of the theme. For example i have created on block/region like..

how to add/create a new block in drupal?

To create a new block region just need to following things..
1. In .info file we need to add block name like..
     regions[sidebar_second] = Sidebar Second
2. Then goto template page and add the below code wherever you want add the block of region.
    <div id="right1" class="clearfix">
            <?php print render($page['sidebar_second']); ?>
     </div>
Note: need to give div id unique