Upgrading Drupal

I upgraded from Drupal 7 to Drupal 9 and the core functionality is working as needed but while finalizing the Drupal 9 configuration, the production Drupal 7 version has had new content, users, categories added. 

How do I now update the Drupal 9 site with the new content that was added to the Drupal 7 production site?

Site is a Drupal 7.73 on FreeBSD 12.1, PHP 7.4.6

Notified of Chaos Tools Suite update today.  Downloaded and installed update and now get this error.

Only one file is listed so I don't know where the function was already declared.

Fatal error: Cannot declare class InsertQuery, because the name is already in use in /usr/home/xxxxxxxxxxxx/includes/includes/database/query.inc on line 728

Please advise.

Thank you.

Hi All,

I am trying to update the composer as well as trying to use the below command to update the module

It always give me below error.

composer update

Error as below

Fatal error: Allowed memory size of 2097152 bytes exhausted (tried to allocate 1982464 bytes) in Unknown on line 0

composer require commerceguys/addressing

Error as below

Fatal error: Allowed memory size of 2097152 bytes exhausted (tried to allocate 1982464 bytes) in Unknown on line 0

Thanks in advance,

Tried upgrading the module and packages and i get this when I access the site

Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException: The service "plugin.manager.bootstrap_layouts" has a dependency on a non-existent service "plugin.manager.core.layout". in Symfony\Component\DependencyInjection\Compiler\CheckExceptionOnInvalidReferenceBehaviorPass->processValue() (line 31 of /home/<SITE_NAME>/public_html/vendor/symfony/dependency-injection/Compiler/CheckExceptionOnInvalidReferenceBehaviorPass.php).

Hello everyone, I'm new in Drupal and I'm working on project, in this moment I try to update PHP and Upgrade Drupal version from 7.73 to 8, and I have a question, what's the easiest way to upgrade this two object, if someone can explain me how to do it will be perfect.

All the best,

mk

This issue has reared its ugly head again in D9.0.6. I properly removed the phpmailer module (in the GUI) and then with composer remove in D8.9.6 before the upgrade. The status report page throws this error: