Fix User warning: The following theme is missing from the file system: classy

Created on 17 May 2025, 18 days ago

Problem/Motivation

The Classy theme was removed from Drupal 11

User warning: The following theme is missing from the file system: classy in Drupal\Core\Extension\ExtensionPathResolver->getPathname() (line 63 of core/lib/Drupal/Core/Extension/ExtensionPathResolver.php).
Drupal\Core\Extension\ExtensionPathResolver->getPathname() (Line: 85)
Drupal\Core\Extension\ExtensionPathResolver->getPath() (Line: 150)
Drupal\Core\Asset\LibraryDiscoveryParser->buildByExtension() (Line: 87)
Drupal\Core\Asset\LibraryDiscoveryCollector->getLibraryDefinitions() (Line: 66)
Drupal\Core\Asset\LibraryDiscoveryCollector->resolveCacheMiss() (Line: 148)
Drupal\Core\Cache\CacheCollector->get() (Line: 166)
Drupal\Core\Asset\LibraryDiscoveryCollector->getLibrariesByExtension() (Line: 173)
Drupal\Core\Asset\LibraryDiscoveryCollector->getLibraryByName() (Line: 68)
Drupal\Core\Asset\LibraryDependencyResolver->doGetDependencies() (Line: 41)
Drupal\Core\Asset\LibraryDependencyResolver->getLibrariesWithDependencies() (Line: 132)
Drupal\Core\Asset\AssetResolver->getLibrariesToLoad() (Line: 191)
Drupal\Core\Asset\AssetResolver->getCssAssets() (Line: 279)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processAssetLibraries() (Line: 123)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processAttachments() (Line: 45)
Drupal\Core\EventSubscriber\HtmlResponseSubscriber->onRespond() (Line: 246)
Symfony\Component\EventDispatcher\EventDispatcher::Symfony\Component\EventDispatcher\{closure}() (Line: 206)
Symfony\Component\EventDispatcher\EventDispatcher->callListeners() (Line: 56)
Symfony\Component\EventDispatcher\EventDispatcher->dispatch() (Line: 216)
Symfony\Component\HttpKernel\HttpKernel->filterResponse() (Line: 204)
Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 76)
Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 53)
Drupal\Core\StackMiddleware\Session->handle() (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 28)
Drupal\Core\StackMiddleware\ContentLength->handle() (Line: 116)
Drupal\page_cache\StackMiddleware\PageCache->pass() (Line: 90)
Drupal\page_cache\StackMiddleware\PageCache->handle() (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 36)
Drupal\Core\StackMiddleware\AjaxPageState->handle() (Line: 51)
Drupal\Core\StackMiddleware\StackedHttpKernel->handle() (Line: 709)
Drupal\Core\DrupalKernel->handle() (Line: 19)

Proposed resolution

  • Remove the use of classy's libraries
  • Fix Drupal standard

Remaining tasks

  • ✅ File an issue
  • ➖ Addition/Change/Update/Fix
  • ➖ Merge request, Patch, or Commit
  • ➖ Testing to ensure no regression
  • ➖ Automated unit testing coverage
  • ➖ Automated functional testing coverage
  • ➖ UX/UI designer responsibilities
  • ➖ Readability
  • ➖ Accessibility
  • ➖ Performance
  • ➖ Security
  • ➖ Documentation
  • ➖ Code review by maintainers
  • ➖ Full testing and approval
  • ➖ Credit contributors
  • ➖ Review with the product owner
  • ➖ Release notes snippet
  • ❌ Release

User interface changes

  • N/A

API changes

  • N/A

Data model changes

  • N/A

Release notes snippet

  • N/A
🐛 Bug report
Status

Active

Version

11.0

Component

Code

Created by

🇯🇴Jordan Rajab Natshah Jordan

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