Block save error - reproducible

@bcobin

I am using block class module regularly and same as you explained but never get this type error.

Can you share the detailed error message? Use $config['system.logging']['error_level'] = 'verbose'; in setting.php or setting.local.php for it.

I think there is some other broken issue which will debug with detailed error message. Also you may check "Recent log messages" for detailed error message.

Thanks, Ravi! See below - there are three errors in the log for each failure.

Something occurs to me: I'm using a Bootstrap 5 subtheme for all affiliates; theme structure is:

themes > custom > subtheme > config > optional > block.block.[subtheme_name]_[various].yml

For each affiliate theme, I'm copying an existing theme and changing the name and content of the .yml file accordingly.

Here's what I'm wondering:

Each .yml file declares a specific ID:

langcode: en
status: true
dependencies:
  config:
    - system.menu.account
  module:
    - system
  theme:
    - [affiliate_theme]
id: [affiliate_theme]_account_menu
theme: [affiliate_theme]
region: nav_additional
weight: -7
provider: null
plugin: 'system_menu_block:account'
settings:
  id: 'system_menu_block:account'
  label: 'User account menu'
  provider: system
  label_display: '0'
  level: 1
  depth: 0
  expand_all_items: false
visibility: {  }

Note the ID under settings. (In this case, id: 'system_menu_block:account')

I haven't changed these IDs. So although the names are different for each affiliate, could the errors be on account of the same id (in this case, 'system_menu_block:account') being used across several sites?

I don't see how this could/should affect custom blocks, though. In any event, below are the error messages. Thanks for reaching out - greatly appreciated!

Error #1:

Warning: Undefined array key "core.extension:global_overrides:[affiliate]_comen" in Drupal\domain_config_ui\Config\ConfigFactory->doLoadMultiple() (line 92 of /home/[site]/web/modules/contrib/domain/domain_config_ui/src/Config/ConfigFactory.php)
#0 /home/[site]/web/core/includes/bootstrap.inc(164): _drupal_error_handler_real(2, 'Undefined array...', '/home/[site]/...', 92)
#1 /home/[site]/web/modules/contrib/domain/domain_config_ui/src/Config/ConfigFactory.php(92): _drupal_error_handler(2, 'Undefined array...', '/home/icrmedia/...', 92)
#2 /home/[site]/web/modules/contrib/domain/domain_config_ui/src/Config/ConfigFactory.php(112): Drupal\domain_config_ui\Config\ConfigFactory->doLoadMultiple(Array, true)
#3 /home/[site]/web/core/lib/Drupal/Core/Config/ConfigFactory.php(89): Drupal\domain_config_ui\Config\ConfigFactory->doGet('core.extension')
#4 /home/[site]/web/core/lib/Drupal/Core/Extension/ThemeHandler.php(70): Drupal\Core\Config\ConfigFactory->get('core.extension')
#5 /home/[site]/web/core/modules/block/block.module(169): Drupal\Core\Extension\ThemeHandler->listInfo()
#6 [internal function]: block_rebuild()
#7 /home/[site]/web/core/lib/Drupal/Core/Extension/ModuleHandler.php(409): call_user_func_array(Object(Closure), Array)
#8 /home/[site]/web/core/lib/Drupal/Core/Extension/ModuleHandler.php(388): Drupal\Core\Extension\ModuleHandler->Drupal\Core\Extension\{closure}(Object(Closure), 'block')
#9 /home/[site]/web/core/lib/Drupal/Core/Extension/ModuleHandler.php(416): Drupal\Core\Extension\ModuleHandler->invokeAllWith('rebuild', Object(Closure))
#10 /home/[site]/web/core/includes/common.inc(510): Drupal\Core\Extension\ModuleHandler->invokeAll('rebuild')
#11 /home/[site]/web/modules/contrib/admin_toolbar/admin_toolbar_tools/src/Controller/ToolbarController.php(205): drupal_flush_all_caches()
#12 [internal function]: Drupal\admin_toolbar_tools\Controller\ToolbarController->flushAll()
#13 /home/[site]/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array(Array, Array)
#14 /home/[site]/web/core/lib/Drupal/Core/Render/Renderer.php(583): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()
#15 /home/[site]/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(124): Drupal\Core\Render\Renderer->executeInRenderContext(Object(Drupal\Core\Render\RenderContext), Object(Closure))
#16 /home/[site]/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array)
#17 /home/[site]/vendor/symfony/http-kernel/HttpKernel.php(166): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()
#18 /home/[site]/vendor/symfony/http-kernel/HttpKernel.php(74): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1)
#19 /home/[site]/web/core/lib/Drupal/Core/StackMiddleware/Session.php(58): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#20 /home/[site]/web/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(48): Drupal\Core\StackMiddleware\Session->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#21 /home/[site]/web/core/modules/page_cache/src/StackMiddleware/PageCache.php(106): Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#22 /home/[site]/web/core/modules/page_cache/src/StackMiddleware/PageCache.php(85): Drupal\page_cache\StackMiddleware\PageCache->pass(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#23 /home/[site]/web/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(48): Drupal\page_cache\StackMiddleware\PageCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#24 /home/[site]/web/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(51): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#25 /home/[site]/web/core/lib/Drupal/Core/StackMiddleware/StackedHttpKernel.php(51): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#26 /home/[site]/web/core/lib/Drupal/Core/DrupalKernel.php(704): Drupal\Core\StackMiddleware\StackedHttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#27 /home/[site]/web/index.php(19): Drupal\Core\DrupalKernel->handle(Object(Symfony\Component\HttpFoundation\Request))
#28 {main}

Error #2:

Error: Call to a member function setModuleOverride() on null in Drupal\domain_config_ui\Config\ConfigFactory->doLoadMultiple() (line 92 of /home/[site]/web/modules/contrib/domain/domain_config_ui/src/Config/ConfigFactory.php).

Error #3:

Drupal\Core\Config\ConfigDuplicateUUIDException: Attempt to save a configuration entity 'babylon_subtheme_countdownblock' with UUID 'e911d7c4-df1d-4394-a00b-58209be2997f' when this entity already exists with UUID '43cf125a-1ed8-45ce-9cfc-297d6e0f5b72' in Drupal\Core\Config\Entity\ConfigEntityBase->preSave() (line 314 of /home/[site]/web/core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php).

OK - here's what happens:

1. Change a block setting and save. (In this case, it was display or override title.)

2. Note that setting doesn't save.

3. Remove any title setting from block and save.

Result: Website reported an unexpected error. (Errors 1 and 2 from above.)

4. Delete block

Result: Website reported an unexpected error. (Error 3 from above.)

5. Re-assign block with desired settings and save.

Result: Success!

So there is a workaround, if you can deal with the error messages.

Any ideas? Thanks!