Drupal 8.x

I have this error in my Apache logs, when I try to install any (official) module. 

[Thu May 16 12:20:01.283171 2019] [php7:notice] [pid 24843] Uncaught PHP Exception Drupal\\Core\\Extension\\Exception\\UnknownExtensionException: "The module hello does not exist." at /var/www/html/core/lib/Drupal/Core/Extension/ExtensionList.php line 522, referer: /admin/modules

Hi all! I am new to Drupal. I am trying to make my site's content different depending on the country of the visitors. This is not just for the site language. Articles on the front page may be different depending on the visitors' countries. The site URL may change to example.com/us (for US visitors) or example.com/au (for Australian visitors).

Hello,

I have just upgraded a Drupla 8.6.10 to a 8.7.1. However once this is done, the whole site does not work anymore, so I made a restore of the site.
So he returned in 8.6.10, but shows me that he is up to date in 8.7.1 (first problem).
The second is that once I want to run my update.php Error 500, ditto if I want to clear the cache.
So I have this error message right now in the logs:

I'm using the Media 'File' type to upload documents. I uploaded a bunch of documents. Then I realized that I had to manually set the metadata mapping for things like file type and size (I'm used to using the file field type which does that automatically). I set up the mapping, which works for new uploads, but is there any way to retroactively pull that metadata from files that have already been uploaded? Thanks for any suggestions.

Hi everyone. I hope you can help with this:

When you use Layout Builder and embed an inline custom block type that contains a Media entity reference field (form display configured with the Media Library widget) you will end up with an additional empty block being placed on the page. Seems to be a bug in the platform but I'm not 100% sure.

This issue occurs for me with the following setup - tested with a fresh install of Drupal 8.7.1 with no contributed modules, just core ones enabled.

Follow these steps to recreate the issue:

1. Enable the following modules:

Hello I have a local D8 site.

I have uploaded it on my shared hosting OVH but it doesn't works.

I've a doubt about directories organization.

I have created the site with composer.

In local, I 've directories like below :

• config
• drush
• scripts
• vendor
• web
  • core
  • libraries
  • modules
  • profiles
  • sites
  • themes

On my shared hosting (ovh) :