Upgrading Drupal

After upgrade drupal core from 8.6.7 to 8.6.9 with composer i have got an error "ThemeHandler.php line 491:The theme my_theme does not exist". I tried to clear the cache, but the site is no longer available. I turned back to 8.6.7. So i neeed al little help. Tank you fred

Hello

I've been testing to upgrade Drupal 7 site to 8, and been using Migrate UI module to achieve that.

Before I do any upgrades, I have been going through Pre Upgrade Analysis step per (https://www.drupal.org/docs/8/upgrade/upgrade-using-web-browser#pre-upgrade-analysis)

I got 57 modules will not be upgraded, and I got modules such as block_class, google_tag, pathauto... etc etc

So, I originally installed D8.6.4 from a tar.gz file and it worked fine.  I now would like to upgrade to ensure that my site is secure and such, and after reading a whole load of documents, I opted for composer, using the "composerize" option.

I have cli access, I installed composerize without incident, I followed (I thought!) the instructions, composerize did its thing apparently successfully, (I ran "composer composerize-drupal" with the root and drupal root dirs listed).  It did not throw errors.

But at that point my site turned into a white page. 

Hi everyone,

Yesterday, I made an upgrade from Drupal 7.61 to 7.63 and for an unknown reason, all the modules (except the Core ones) were disabled.

I have several backup of the website, how can I retrieve in the last ones the actived and desactivated modules ?

Is there a file where I can find those informations ?

Thank you in advance.

Hi all,

because of a security warning I upgraded from 7.59 to 7.60 according to the instructions https://www.drupal.org/docs/7/update/core-option-2

But still after the update the status report says that 7.59 in installed and I keep getting the security warning. 

In modules/system/system.info it shows version 7.60, same in CHANGELOG.txt.

I repeated the update process several times but still the old version is shown in status report and the security warning remains.

Hi 

I was trying upgrade drupal 8.6.5 to 8.6.7, but after it shows: "The website encountered an unexpected error. Please try again later.".

Logs are below. What to do with that? I've got  PHP 7.3.0. Plese help.