Custom Search form not working in localhost

The form has to updated as

 <form id="cptsearch" action="<?php echo home_url(); ?>" method="get">
        <input type="text" name="s" />
        <input type="hidden" name="post_type" value="POSTTYPENAME" />
        <input id="searchsubmit" type="submit" alt="Search" value="Search" />
    </form>