Module (Album) could not be initial - ZendFramework3 - Tutorial

I tried to follow the tutorial of Zend Fremework 3, step by step, but I get the following error:

Fatal error: Uncaught exception 'Zend\ModuleManager\Exception\RuntimeException' with message 'Module (Album) could not be initialized.' in /var/www/html/skeleton-application/vendor/zendframework/zend-modulemanager/src/ModuleManager.php:203 Stack trace: #0 /var/www/html/skeleton-application/vendor/zendframework/zend-modulemanager/src/ModuleManager.php(175): Zend\ModuleManager\ModuleManager->loadModuleByName(Object(Zend\ModuleManager\ModuleEvent)) #1 /var/www/html/skeleton-application/vendor/zendframework/zend-modulemanager/src/ModuleManager.php(97): Zend\ModuleManager\ModuleManager->loadModule('Album') #2 /var/www/html/skeleton-application/vendor/zendframework/zend-eventmanager/src/EventManager.php(271): Zend\ModuleManager\ModuleManager->onLoadModules(Object(Zend\ModuleManager\ModuleEvent)) #3 /var/www/html/skeleton-application/vendor/zendframework/zend-eventmanager/src/EventManager.php(143): Zend\EventManager\EventManager->triggerListeners(Object(Zend\ModuleManager\ModuleEvent)) #4 /var/www/html/skeleton-application/vendo in /var/www/html/skeleton-application/vendor/zendframework/zend-modulemanager/src/ModuleManager.php on line 203

This is my config/modules.config.php file:

return [
'Zend\Form',
'Zend\Db',
'Zend\Cache',
'ZendDeveloperTools',
'Zend\Router',
'Zend\Validator',
'Application',
'Album', ];

If I comment the 'Album' entry, the homepage is displayed properly.

Can someone give me some suggestions?

Thanks

Solution

Looking at the error message I'm guessing you are at setting up the Album module.

You need to check composer.json if the following is included:

"autoload": {
    "psr-4": {
        "Application\\": "module/Application/src/",
        "Album\\": "module/Album/src/"
    }
},

After that you need to run composer dump-autoload to update the autoloading rules.

If this doesn't help, please tell at what stage you are.