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Drupal\Component\Plugin\Exception\PluginException: The plugin (svg) did not specify an instance class.

Open on Drupal.org →
Created on 1 April 2025, about 1 month ago

Problem/Motivation

Drupal\Component\Plugin\Exception\PluginException: The plugin (svg) did not specify an instance class. in Drupal\Component\Plugin\Factory\DefaultFactory::getPluginClass() (line 79 of core/lib/Drupal/Component/Plugin/Factory/DefaultFactory.php).
Drupal\Core\Plugin\Factory\ContainerFactory->createInstance() (Line: 83)
Drupal\Component\Plugin\PluginManagerBase->createInstance() (Line: 62)
Drupal\Core\Plugin\DefaultSingleLazyPluginCollection->initializePlugin() (Line: 80)
Drupal\Component\Plugin\LazyPluginCollection->get() (Line: 88)
Drupal\Core\Plugin\DefaultSingleLazyPluginCollection->setConfiguration() (Line: 104)
Drupal\Core\Plugin\DefaultSingleLazyPluginCollection->addInstanceId() (Line: 55)
Drupal\Core\Plugin\DefaultSingleLazyPluginCollection->__construct() (Line: 204)
Drupal\media\Entity\MediaType->sourcePluginCollection() (Line: 193)
Drupal\media\Entity\MediaType->getSource() (Line: 48)
media_entity_file_replace_entity_extra_field_info()
call_user_func_array() (Line: 416)
Drupal\Core\Extension\ModuleHandler->Drupal\Core\Extension\{closure}() (Line: 395)
Drupal\Core\Extension\ModuleHandler->invokeAllWith() (Line: 423)
Drupal\Core\Extension\ModuleHandler->invokeAll() (Line: 676)
Drupal\Core\Entity\EntityFieldManager->loadExtraFields() (Line: 649)
Drupal\Core\Entity\EntityFieldManager->getExtraFields() (Line: 173)
Drupal\Core\Entity\EntityDisplayBase->init() (Line: 155)
Drupal\Core\Entity\EntityDisplayBase->__construct() (Line: 181)
Drupal\Core\Entity\Entity\EntityViewDisplay->__construct() (Line: 48)
Drupal\layout_builder\Entity\LayoutBuilderEntityViewDisplay->__construct() (Line: 418)
Drupal\Core\Entity\EntityStorageBase->mapFromStorageRecords() (Line: 41)
Drupal\layout_builder\Entity\LayoutBuilderEntityViewDisplayStorage->mapFromStorageRecords() (Line: 186)
Drupal\Core\Config\Entity\ConfigEntityStorage->doLoadMultiple() (Line: 312)
Drupal\Core\Entity\EntityStorageBase->loadMultiple() (Line: 121)
Drupal\Core\Entity\Entity\EntityViewDisplay::collectRenderDisplays() (Line: 281)
Drupal\Core\Entity\EntityViewBuilder->buildMultiple() (Line: 239)
Drupal\Core\Entity\EntityViewBuilder->build()
call_user_func_array() (Line: 113)
Drupal\Core\Render\Renderer->doTrustedCallback() (Line: 870)
Drupal\Core\Render\Renderer->doCallback() (Line: 432)
Drupal\Core\Render\Renderer->doRender() (Line: 248)
Drupal\Core\Render\Renderer->render() (Line: 238)
Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 638)
Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 239)
Drupal\Core\Render\MainContent\HtmlRenderer->prepare() (Line: 128)
Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse() (Line: 90)
Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray()
call_user_func() (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch() (Line: 186)
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: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass() (Line: 85)
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: 741)
Drupal\Core\DrupalKernel->handle() (Line: 19)

Steps to reproduce

Updated from 2.3.3 to 2.3.4 and now receiving the above error

Using Drupal version 10.3.6

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

🐛 Bug report
Status

Active

Version

2.3

Component

Code

Created by

🇦🇺Australia ben.campbell

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Comments & Activities

  • Issue created by @ben.campbell
  • Comment about 1 month ago →
    🇪🇨Ecuador jwilson3

    @ben.campbell, does rebuilding all caches after updating, as indicated in the 2.3.4 release notes → resolve the problem?

  • Comment about 1 month ago →
    🇪🇨Ecuador jwilson3
  • Comment about 1 month ago →
    🇦🇺Australia ben.campbell

    @jwilson3 unfortunately it doesn't

  • Comment about 1 month ago →
    🇪🇨Ecuador jwilson3
  • Comment about 1 month ago →
    🇪🇨Ecuador jwilson3

    @ben.campbell, thanks for the feedback. Can you tell me a little more about your setup please.

    Verify plugin file location Confirm the Svg.php file is in the correct location according to the namespace. If installed via composer with a conventional Drupal composer installation the file should be located in web/modules/custom/svg_image_field/src/Plugin/media/Source/Svg.php (the top-level folder "web" might instead be called "docroot" or something similar, or in some rare cases may not even be present).

    Confirm case-sensitive filesystem: Are you running on an operating system that leverages a case sensitive filesystem like Windows or Mac?

    Confirm title-case filename: Please verify that the filename is exactly Svg.php and not SVG.php, noting correct capitalization of the first letter only. This file is located at modules/contrib/svg_image_field/src/Plugin/media/Source/Svg.php. The 'svg' MediaSource plugin not being found could be related to the file's case not getting changed properly in the version upgrade to 2.3.4.

    Rebuild composer's autoload files. Run a composer dump-autoload. Then another drush cache:rebuild, and then check again to see if the problem goes away.

    Check file permissions:. Ensure the Svg.php file has proper read permissions and can be read by the webserver with:

    chmod 644 web/modules/custom/svg_image_field/src/Plugin/media/Source/Svg.php

    Check for stale cache files: Sometimes old cached versions of the plugin definition can persist. Please check and clear:

    sites/default/files/php/twig/*
sites/default/files/php/*
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