The requested page could not be found error appear in page but page is render correctly-drupal 7 i had create one block in my custom module, which display in "CONTENT" region, only on "currant-trustees" page.

when i access url "localhost/drupal/currant-trustees" page is render correctly, but with error "The requested page "/drupal/currant-trustees" could not be found." and also page title is page not found.
It sounds to me like you only want to show said block on that page and nothing else. You might be better off implementing hook_menu() to register a callback (a page) which displays custom content, instead of creating an empty page and showing a block on that.

It might look something like this:

/**
 * Implements hook_menu().
 */
function MYMODULE_menu() {
  $items['currant-trustees'] = array(
    'page callback' =&gt; 'MYMODULE_currant_trustees',
    'title' =&gt; 'Currant trustees',
    'type' =&gt; MENU_CALLBACK,
  );
  return $items;
}
function MYMODULE_currant_trustees() {
  $content = 'This is where your content should go, just copy the code from the block content';

  return $content;
}