The website encountered an unexpected error. after "composer update "

What exact commands did you type to upgrade and what was their ouput?

index.php is "denied by server configuration". What is the server configuration?

I used the command " composer update! , there was on problem during the update.
my site was there for year without problem, no change on any server configuration, so I don't know what server configuration means here. what can I do to check the problem ?

“Server” means “the web server” in this situation. The web server is misconfigured.

I don't know where to check the problem since the site completely dead. but my hosting support providing me with this ( I don't know where he got this since there is nothing showing on the screen ) :

Uncaught PHP Exception Drupal\Component\Plugin\Exception\PluginNotFoundException: "The "entity_bundle:node" plugin does not exist. Valid plugin IDs for Drupal\rules\Core\ConditionManager are: rules_list_contains, rules_user_is_blocked, rules_entity_is_of_type, rules_data_is_empty

That is probably 🐛 upgrading from D10.1.8 to D10.3.0 .. "entity_bundle:node Closed: duplicate .

When an update fails you should have a plan and a procedure to restore from a backup.

When I've seen this it's usually been an issue with file permissions. I don't know why an upgrade would have changed them but it's worth checking.

There has been no further discussion here for 3 months on the support request. Considering that the site was 'completely dead' a resolution was likely found with the information here or elsewhere.

The Drupal Core issue queue is not the ideal place for support requests. The 'support request' option is there for filing support issues for contributed modules and themes. There are several support options listed on our support page → (Community > Support at the top of Drupal.org) and there is Drupal Slack → . You may get better replies in one of those places.