Recently I upgraded to Drupal 10.3.10 and it broke my website. I started getting an error about the Bootstrap theme TypeError: Drupal\Core\Theme\Registry::__construct(): Argument #9 ($kernel) must be of type ?Symfony\Component\HttpKernel\HttpKernelInterface, string given, called in /var/www/html/web/themes/contrib/bootstrap/src/Plugin/Alter/ThemeRegistry.php on line 44 in Drupal\Core\Theme\Registry->__construct() (line 188 of core/lib/Drupal/Core/Theme/Registry.php).
I found this thread 🐛 Argument #9 ($kernel) must be of type ? Fixed , which suggested updating Bootstrap to the latest version and as soon as I did, I started getting a new error:
Drupal\Core\Asset\Exception\InvalidLibrariesExtendSpecificationException: The specified library "bootstrap/drupal.tableheader" does not exist. in Drupal\Core\Asset\LibraryDiscoveryCollector->applyLibrariesExtend() (line 155 of core/lib/Drupal/Core/Asset/LibraryDiscoveryCollector.php).
I tried searching online, but couldn't find any threads anywhere about this error.
My default theme is a subtheme of Bootstrap.
1. Install Drupal 10.3.10
2. Install Bootstrap theme
3. Create a subtheme of the bootstrap theme and set that as the default theme
Any help would be greatly appreciated!
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Update: I rolled back my Drupal installation to a backup, followed the steps here → to update, switched my theme to Olivero using drush, then used composer to update to the latest 8.x.-3. version, used the available updates page to run database updates and I no longer am getting any errors.