Error while updating Drupal core?

Question

Drupal

I updated the Drupal core from version 7.64 to version 8.6.13, after the update the site does not open, but the following appears:
The website encountered an unexpected error. Please try again later.Symfony\Component\HttpKernel\Exception\NotFoundHttpException: in Drupal\Core\PathProcessor\PathProcessorFront->processInbound() (line 43 of core/lib/Drupal/Core/PathProcessor/PathProcessorFront.php).
When trying the /update.php command, the following appears:
The website encountered an unexpected error. Please try again later. Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException: You have requested a non-existent service "access_check.db_update". in Symfony\Component\DependencyInjection\ContainerBuilder->getDefinition() (line 1053 of vendor/symfony/dependency-injection/ContainerBuilder.php).
How to fix this error without using a saved copy of the site?

Answer 1

Drupal 7 and Drupal 8 are backwards incompatible and have completely different architectures. It just won’t work that way, you need to migrate using the migrate module, which is already part of the core in Drupal 8.
https://www.drupal.org/docs/8/upgrade/upgrading-fr...