I solved it Myself :D
add these lines to __construct function in bootstrap :
$resourceLoader = new Zend_Loader_Autoloader_Resource(array(
'namespace' =>
'Application_',
'basePath' =>
ROOT_DIR .'/application/'
));
$resourceLoader->addResourceTypes(array(
'Model' => array('path' =>
'models', 'namespace' => 'Model'),
'DbTable' => array('path' =>
'models/DbTable', 'namespace' => 'DbTable') )
);
Shahrzad ;)
