Upgrading Drupal

I am running Upgrade Status on the Fitbit module because I need it for a Drupal 9 project.

I am getting a lot of complaints about missing classes from PHPUnit.

They're all from core tests. This particular module does not come with unit testing.

Any idea what these are and how to fix it?

Full report follows:

I manage the site https://www.marketingaziende.it on sharing host (no ssh access). I upgraded from 7.78 to 7.80. After running update.php, numerous errors occurred and the site could not be accessed, including the administration pages. After a few tries, I copied the old version of the software and restored the database. Despite this the system continued to generate errors (An error has occurred. Please try again later). After fiddling with a bit (e.g.

I upgraded drupal from 8.1.3 to 8.1.14 and now I am having problems with the views module. In any views, I can add context filters, but I cannot remove them. Even if I create any new views I can add a context filter, then I cannot remove the context filter. The log shows no errors. I've tried uninstalling and reinstalling the views UI but it didn't work for me. How can I look for what is the problem if the error log is empty?

ecwid online store only works with drupal 8 and not 9. I found a fix online but it doesn't give clear instructions on how to use the patch. it doesn't give clear instructions to me at all. i'm not a professional developer im just a Engineering student.

Automated Drupal 9 compatibility fixes [#3140313] | Drupal.org

Dear all,

I run a small private website on 1&1 (IONOS) Server. When ordered the Version 9.1.5. was installed. All Updates are not done by the provider.

So, yesterday I started to manually update to 9.1.7 security update and I followed strictly the guide here:
https://www.drupal.org/docs/updating-drupal/updating-drupal-core-manually

Hi,

I plan an update of a Drupal website.
This website runs Drupal 8.3.7
The environment runs under PHP 5.6.
The idea is to update everything to the latest versions possible.
I figured out that 8.x cannot run under PHP 8. It will be PHP 7.4 then.