Upgrading Drupal

The upgrade process seems to have gone well.

The first problem seems to be that some parameters in the $Server array had been renamed with the REDIRECTION_ prefix ...
Although this might not come directly from drupal itself but rather from one of the required upgrades related the passing to 9.1.2 ... most likely apache.

So i changed the parameters in the custom modules and everything seemed to work. 

but then here is the bigger problem ..

1.First, let's create a server that can support the runnig of Drupal 9 and composer with the extentions listed below: 

• php
• maria DB
• drush
• git
• composer

2.Clone both files and DB of the current Drupal 8 site
3.Upgrade Core, Modules & Theme
4.Upgrade site to Drupal 9 using composer, by runing the code below in cli:

After upgrading Drupal from 8.9 to 9.2, config import was failing in the hosting environment, in local it was working fine.

Issue was that on running drush cim on the server, it was deleting all the configs and so config import was rejected. And error was as below:

My server provider set's their servers up using Plesk. There is no plans on upgrading CentOS Linux to a version that has Apache greater than what I have now which is 2.4.6. I know Apache still supports 2.4.6 and keeps updating it. Is there any way I can still do the upgrade to 9 and still keep my 2.4.6? Plesk license doesn't allow for people to do upgrades of the underlying software themselves. All the updates have to go through the Plesk upgrade system.

I need to know what else I can do and pass it on to the server people to see what is going to be allowed.

I've have used "Upgrade Status" and checked that all the requirement are met and all my modules are compatible with Drupal 9.

Then I followed the steps found in the documentation. First I issued the following commands:

chmod 777 web/sites/default
find web/sites/default -name "*settings.php" -exec chmod 777 {} \;
find web/sites/default -name "*services.yml" -exec chmod 777 {} \;

Then I issued the following command:

Hello,

I hope somebody can help me. I did upgrade to 9.2.0. from 9.1.10. Since I did the upgrade I have a problem,

cron is not possible:

Error: Call to undefined method Symfony\Component\Mime\Header\Headers::addHeader() in Drupal\Core\Mail\Plugin\Mail\PhpMail->mail() (regel 92 van/mywebsite.com/public_html/drupal9/core/lib/Drupal/Core/Mail/Plugin/Mail/PhpMail.php)

same message after a user asked for a new password