Some thing wrong with my custom menu

I follow the tutorial in chapter 6 of the book named "Packtpub.Drupal.7.Module.Development.Dec.2010.pdf"
this is an complex module named "Artwork" , so I just want to create simple one : "mybook drupal"
When I enable ArtWork module the administer menu has new item like below:(the rectangle with red borders)
link to image
and this is my code

function mybook_entity_info()
 {
	 $return['mybook'] = array(
	 'label' => t('My book'),
	 'uri callback' =>'mybook_uri',
	 'base table'=> 'mybook',
	 'entity keys' => array(
     'id' => 'bookid',
	 'revision' => 'vid',
      'bundle' => '',
      'label' => '',
     ),
	 'static cache' => TRUE,
	 'bundles' => array(),
	 );
	 
	 return $return;
 }
 
 function mybook_uri($mybook)
 {
	 return array('path'=>'mybook/'.$mybook->bookid);
 }
 
 /**
 * Implements hook_permission().
 */
 
 function mybook_permission()
 {
	 return array(
	 'admin book' => array('title'=>t('Administer Books')),
	 'view book'  => array('title'=>t('View book')),
	 'create book' => array('title'=>t('Create Books')),
	 'update book' => array('title'=>t('Update Books')),
	 'delete book' => array('title'=>t('Delete Books')),
	 );
 }
 /**
 * Implements hook_menu().
 */
 
 function mybook_menu()
 {
	 $items = array();
	 $items['mybook'] = array(
	 'title'=> t('My Book'),
     'access arguments' => array('admin book'),
     'weight' => 0,
     'menu_name' => 'management',
	 );
	 
	 $items['mybook/addnewbook'] =array(
	 'title' => t('Add new book'),
	 //'page callback' => 'add_new_book',
	 'access arguments' => array('create book'),
	 'menu_name' => 'management',
	 'weight' => 0,
	 );
	 $items['mybook/showall'] =array(
	 'title' => t('Show all'),
	 //'page callback' => 'show_all_book',
	 'access arguments' => array('view book'),
	 'menu_name' => 'management',
	 'weight' => 0,
	 );
	 return $items;
 }

so what I get when I clear all cache is :
Click to link image

but when I enable my module and clear all cache , notthing is happen!
Can you fix it for me! thank alot ! I think the function "mybook_menu()" get some err, but I couldn't find out !
Thank a lot!