安装 flarum 后出错,网站打开白板.已经谷歌过了(英文论坛暂时没去)

安装文档:
http://justjavac.gitbooks.io/flarum/content/using/installation.html

vps 环境(lnmp 一键安装的):

PHP:5.5.25
MySQL:5.5.42
php-mysql-5.3.3-46.el6_6.x86_64
mysql-libs-5.1.73-5.el6_6.x86_64

上传安装文件至 /home/wwwroot/default

解压.

访问网址,空白.

已添加 Nginx 规则.
已按下列网址说明排除
http://justjavac.gitbooks.io/flarum/content/using/troubleshooting.html

第二种安装方式:

下载安装包，解压，上传文件到服务器
进入根目录，运行 php flarum/flarum install.
填写网址信息：如网站名称、管理员信息、数据库信息

输出日志(涉及隐私内容*号处理,请体谅):

Installing Flarum...
Database host: localhost
Database name: flarum
Database user: root
Database password: PHP Notice: Undefined variable: output in /home/wwwroot/default/flarum/vendor/symfony/console/Helper/QuestionHelper.php on line 437
PHP Notice: Undefined variable: exitcode in /home/wwwroot/default/flarum/vendor/symfony/console/Helper/QuestionHelper.php on line 437
PHP Warning: exec () has been disabled for security reasons in /home/wwwroot/default/flarum/vendor/symfony/console/Helper/QuestionHelper.php on line 437
PHP Notice: Undefined variable: exitcode in /home/wwwroot/default/flarum/vendor/symfony/console/Helper/QuestionHelper.php on line 439
PHP Warning: shell_exec () has been disabled for security reasons in /home/wwwroot/default/flarum/vendor/symfony/console/Helper/QuestionHelper.php on line 416
PHP Warning: shell_exec () has been disabled for security reasons in /home/wwwroot/default/flarum/vendor/symfony/console/Helper/QuestionHelper.php on line 416
PHP Warning: shell_exec () has been disabled for security reasons in /home/wwwroot/default/flarum/vendor/symfony/console/Helper/QuestionHelper.php on line 416
PHP Warning: shell_exec () has been disabled for security reasons in /home/wwwroot/default/flarum/vendor/symfony/console/Helper/QuestionHelper.php on line 416
******** (此为密码,打星号处理)
Prefix:
Base URL: www.overlooking.ml
Testing config
Writing config
Migrated: 2015_02_24_000000_create_access_tokens_table
Migrated: 2015_02_24_000000_create_config_table
Migrated: 2015_02_24_000000_create_discussions_table
Migrated: 2015_02_24_000000_create_email_tokens_table
Migrated: 2015_02_24_000000_create_groups_table
Migrated: 2015_02_24_000000_create_notifications_table
Migrated: 2015_02_24_000000_create_password_tokens_table
Migrated: 2015_02_24_000000_create_permissions_table
Migrated: 2015_02_24_000000_create_posts_table
Migrated: 2015_02_24_000000_create_users_discussions_table
Migrated: 2015_02_24_000000_create_users_groups_table
Migrated: 2015_02_24_000000_create_users_table
Forum title: ????^H^H (无视掉)
Writing default settings
Admin username: ********
Admin password: *************
Admin email address: ************@gmail.com
Creating admin user ******
PHP Warning: scandir () has been disabled for security reasons in /home/wwwroot/default/flarum/vendor/flarum/core/src/Support/ExtensionManager.php on line 37
PHP Warning: array_diff (): Argument #1 is not an array in /home/wwwroot/default/flarum/vendor/flarum/core/src/Support/ExtensionManager.php on line 37
PHP Warning: Invalid argument supplied for foreach () in /home/wwwroot/default/flarum/vendor/flarum/core/src/Support/ExtensionManager.php on line 40
DONE.