Page Templates per Content Type in Drupal 7 : The requested page "/appl/?q=lawn" could not be found.

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PHP

Drupal

I need to develop a page template based on the custom content type,because I don't want to use the page.tpl.php file template.

I have followed the below steps for creating Page Templates per Content Type. I am working drupal 7 bartik theme

My steps are:
1.I have added below code in the theme template file like

function bartik_preprocess_page(&$vars) {
   if (isset($vars['node']->type)) {
      $vars['theme_hook_suggestions'][] = 'page__' . $vars['node']->type;
   }
}

2.I have created a content type named as lawngarden (Machine name: lawn)
3.I have created a page template (page--lawn.tpl.php) under themes templates folder
4.I have clear the cache
5.Enter the url in browser like http://localhost/appl/?q=lawn(clean url's disabled) & http://localhost/appl/lawn(clean url's enabled)
6.The page displays like requested page "/appl/?q=lawn" could not be found.

Please help me and provide me with suggestions. Thanks in advance.