Installing Drupal

I have a site that was upgraded from Drupal 6 to 7 and now it is finally Drupal 8.1.1 But there are some strange problems.

1) I put the site offline, and now I can't go back online. I get the following error message:

Fatal error: Cannot instantiate interface Drupal\Core\Cache\CacheBackendInterface in /home/mysitename/public_html/core/lib/Drupal/Component/DependencyInjection/Container.php on line 268

2) status report gives me the following problems:

Hello,

I am trying to setup Drupal 8.1.3 with below system configuration, but i am getting "Access forbidden!" error.

Windows 7
XAMPP 3.2.2

Apache Error log:

No matching DirectoryIndex (index.php,index.html,index.htm) found, and server-generated directory index forbidden by Options directive

Please help me out in this.

During the cleanup phase of installation, I am obtaining the following error. This is a fresh installation on a machine. I am a beginner with Linux and Drupal so any help is appreciated.

Warning: array_flip(): Can only flip STRING and INTEGER values! in DrupalDefaultEntityController->load() (line 175 of /var/www/html/includes/entity.inc).

Unknown data property og_group_ref.

Hey guys.

I'm trying to install D8.1.2 with a custom profile using drush. In the profile install hook, I'm trying to set the system.date:timezone.default config using the following code

  \Drupal::configFactory()->getEditable('system.date')->set('timezone.default', 'Europe/Bucharest')->save();

Using "get" afterwards shows that it was saved properly.

I would like a particular multi-site installation (I'm testing drupal 8.1.2), as described below.

- many websites with front-end URLs, like:
site1.example.com (website1+DB1)
site2.example.com (website2+DB2)
...
- all the back-end (management) URLs for the above sites as subdirectories of a unique (different) website, like:
admin.example.com/site1 (website1+DB1)
admin.example.com/site2 (website2+DB2)
...

Right now when I create a new Drupal project from

composer create-project --keep-vcs drupal-composer/drupal-project:8.x-dev d8

I end up with a core-install with the

	drupal-composer/drupal-project

scaffold, and the default repository