I just installed theme ABC on DRUPAL 10.2.5 and receiving following error right after I installed it and used as default (when visit any content)
Warning: file_get_contents(themes/contrib/abc/_custom/custom-style.css): Failed to open stream: No such file or directory in Drupal\Core\Asset\CssCollectionOptimizerLazy->generateHash() (line 43 of core/lib/Drupal/Core/Asset/AssetGroupSetHashTrait.php).
Drupal\Core\Asset\CssCollectionOptimizerLazy->generateHash(Array) (Line: 120)
Drupal\Core\Asset\CssCollectionOptimizerLazy->optimize(Array, Array, Object) (Line: 179)
Drupal\Core\Asset\AssetResolver->getCssAssets(Object, 1, Object) (Line: 321)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processAssetLibraries(Object, Array) (Line: 165)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processAttachments(Object) (Line: 97)
Drupal\big_pipe\Render\BigPipeResponseAttachmentsProcessor->processAttachments(Object) (Line: 45)
Drupal\Core\EventSubscriber\HtmlResponseSubscriber->onRespond(Object, 'kernel.response', Object)
call_user_func(Array, Object, 'kernel.response', Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.response') (Line: 214)
Symfony\Component\HttpKernel\HttpKernel->filterResponse(Object, Object, 1) (Line: 202)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 76)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 58)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 28)
Drupal\Core\StackMiddleware\ContentLength->handle(Object, 1, 1) (Line: 32)
Drupal\big_pipe\StackMiddleware\ContentLength->handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 36)
Drupal\Core\StackMiddleware\AjaxPageState->handle(Object, 1, 1) (Line: 51)
Drupal\Core\StackMiddleware\StackedHttpKernel->handle(Object, 1, 1) (Line: 704)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)
Closed: works as designed
1.13
Code
You should o the following, after each module or theme update:
1) Run update: YOUR SITE.com/update.php
2) Clear the cache
In case you did not customize your ABC theme, it is a good idea to rename abc/_custom/example.custom-style.css to abc/_custom/custom-style.css