打开php项目网站，页面显示为空白

环境：apache，php用的是苹果自带的
项目是放在默认DocumentRoot: "/Library/WebServer/Documents"下面

新建的VirtualHost 的DocumentRoot: "/Library/WebServer/Documents/myProject/public"
在public目录下有index.phtml文件

cat public/index.php

/**

• This makes our life easier when dealing with paths. Everything is relative
• to the application root now. */

chdir(dirname(__DIR__));

// Decline static file requests back to the PHP built-in webserver

if (php_sapi_name() === 'cli-server' && is_file(__DIR__ . parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH))) {
return false;
}

// Setup autoloading
require 'init_autoloader.php';

// Run the application!
Zend\Mvc\Application::init(require 'config/application.config.php')->run();

打开网页后，显示空白，错误信息是
[Error] Failed to load resource: the server responded with a status of 500 (Internal Server Error)

然后我在index.php里面添加了一句phpinfo(）,然后页面显示了phpinfo的页面

以上我的情况和问题就是这样，请教各位大神帮我看看问题是出在哪里了！多谢！！
补充：查看了/var/log/apache2/erro_log
显示错误为AsseticWriter : Unable to create a directory