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"User warning: The following theme is missing from the file system: media in drupal_get_filename()"

What does this error message mean? How can I fix it?

User warning: The following theme is missing from the file system: media in drupal_get_filename() (line 268 of core/includes/bootstrap.inc).
drupal_get_filename(‘theme’, ‘media’) (Line: 291)
drupal_get_path(‘theme’, ‘media’) (Line: 394)
DrupalCoreAssetLibraryDiscoveryParser->drupalGetPath(‘theme’, ‘media’) (Line: 85)
DrupalCoreAssetLibraryDiscoveryParser->buildByExtension(‘media’) (Line: 87)
DrupalCoreAssetLibraryDiscoveryCollector->getLibraryDefinitions(‘media’) (Line: 66)
DrupalCoreAssetLibraryDiscoveryCollector->resolveCacheMiss(‘media’) (Line: 149)
DrupalCoreCacheCacheCollector->get(‘media’) (Line: 44)
DrupalCoreAssetLibraryDiscovery->getLibrariesByExtension(‘media’) (Line: 58)
DrupalCoreAssetLibraryDiscovery->getLibraryByName(‘media’, ‘form’) (Line: 54)
DrupalCoreAssetLibraryDependencyResolver->doGetDependencies(Array, Array) (Line: 56)
DrupalCoreAssetLibraryDependencyResolver->doGetDependencies(Array) (Line: 31) DrupalCoreAssetLibraryDependencyResolver->getLibrariesWithDependencies(Array) (Line: 104)
DrupalCoreAssetAssetResolver->getLibrariesToLoad(Object) (Line: 116)
DrupalCoreAssetAssetResolver->getCssAssets(Object, ) (Line: 291)
DrupalCoreRenderHtmlResponseAttachmentsProcessor->processAssetLibraries(Object, Array) (Line: 161)
DrupalCoreRenderHtmlResponseAttachmentsProcessor->processAttachments(Object) (Line: 45)
DrupalCoreEventSubscriberHtmlResponseSubscriber->onRespond(Object, ‘kernel.response’, Object) call_user_func(Array, Object, ‘kernel.response’, Object) (Line: 111)
DrupalComponentEventDispatcherContainerAwareEventDispatcher->dispatch(‘kernel.response’, Object) (Line: 191)
SymfonyComponentHttpKernelHttpKernel->filterResponse(Object, Object, 1) (Line: 173)
SymfonyComponentHttpKernelHttpKernel->handleRaw(Object, 1) (Line: 68)
SymfonyComponentHttpKernelHttpKernel->handle(Object, 1, 1) (Line: 57)
DrupalCoreStackMiddlewareSession->handle(Object, 1, 1) (Line: 47)
DrupalCoreStackMiddlewareKernelPreHandle->handle(Object, 1, 1) (Line: 99)
Drupalpage_cacheStackMiddlewarePageCache->pass(Object, 1, 1) (Line: 78)
Drupalpage_cacheStackMiddlewarePageCache->handle(Object, 1, 1) (Line: 47)
DrupalCoreStackMiddlewareReverseProxyMiddleware->handle(Object, 1, 1) (Line: 50)
DrupalCoreStackMiddlewareNegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
StackStackedHttpKernel->handle(Object, 1, 1) (Line: 664)
DrupalCoreDrupalKernel->handle(Object) (Line: 19)

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"User warning: The following theme is missing from the file system: media in drupal_get_filename()"

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