Can't find a class to solve the idea

Cannot find class
In the model, write a class like this
Class debut extends zend_db_table{
Protected $_name = ' debut ';
Protected $_id = ' id ';

Public Function Getinfos () {
$select = $this->_db->select ();
$select->from ($this->_name);
$result = $this->_db->fetchall ($select);
return $result;
}
}
New object Error in action
Error message: Fatal Error:class ' debut ' not found in C:\Users\admin\Zend\workspaces\DefaultWorkspace7\test\application\ controllers\testcontroller.php on line 4
In the compilation environment can find the corresponding class, ask why AH?
------to solve the idea----------------------
You didn't introduce the debut class definition in testcontroller.php.
The possible causes are:
You did not execute your program in the framework
Debut class definition file naming rules that do not conform to framework conventions
The debut class definition file is not in the Frame Convention location

------to solve the idea----------------------
Have you used a namespace for wood?

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