Phalcon multi-module configuration problem

The official manual has the following code to register multiple modules

<code>// 注册模块
$application->registerModules(
    array(
        'frontend' => array(
            'className' => 'Multiple\Frontend\Module',
            'path'      => '../apps/frontend/Module.php',
        ),
        'backend'  => array(
            'className' => 'Multiple\Backend\Module',
            'path'      => '../apps/backend/Module.php',
        )
    )
);</code>

Where 'className' => 'MultipleFrontendModule', what does it mean? According to the official file configuration, the following is always displayed:

'MultipleFrontendModule' wasn't found in the dependency injection container

Reply content:

The official manual has the following code to register multiple modules

<code>// 注册模块
$application->registerModules(
    array(
        'frontend' => array(
            'className' => 'Multiple\Frontend\Module',
            'path'      => '../apps/frontend/Module.php',
        ),
        'backend'  => array(
            'className' => 'Multiple\Backend\Module',
            'path'      => '../apps/backend/Module.php',
        )
    )
);</code>

Where 'className' => 'MultipleFrontendModule', what does it mean? According to the official file configuration, the following is always displayed:

'MultipleFrontendModule' wasn't found in the dependency injection container

1. Does the file apps/frontend/Module.php exist and the path is correct

2. In this file, is there a class named Module?

Whether the namespace of this class is
3. MutipleFrontend

Let’s check them one by one (slip