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Drupal\Core\Config\StorageException: Write operation is not allowed. in Drupal\Core\Config\InstallStorage->write() (line 104 of core/lib/Drupal/Core/Config/InstallStorage.php).
Drupal\Core\Config\InstallStorage->write() (Line: 226)
Drupal\Core\Config\Config->save() (Line: 300)
Drupal\Core\Config\Entity\ConfigEntityStorage->doSave() (Line: 486)
Drupal\Core\Entity\EntityStorageBase->save() (Line: 279)
Drupal\Core\Config\Entity\ConfigEntityStorage->save() (Line: 354)
Drupal\Core\Entity\EntityBase->save() (Line: 639)
Drupal\Core\Config\Entity\ConfigEntityBase->save() (Line: 67)
migrate_plus_migration_plugins_alter() (Line: 552)
Drupal\Core\Extension\ModuleHandler->alter() (Line: 386)
Drupal\Core\Plugin\DefaultPluginManager->alterDefinitions() (Line: 259)
Drupal\migrate\Plugin\MigrationPluginManager->findDefinitions() (Line: 213)
Drupal\Core\Plugin\DefaultPluginManager->getDefinitions() (Line: 102)
Drupal\migrate\Plugin\MigrationPluginManager->createInstances() (Line: 20)
w21_migrate_views_data_alter() (Line: 552)
Drupal\Core\Extension\ModuleHandler->alter() (Line: 237)
Drupal\views\ViewsData->getData() (Line: 151)
Drupal\views\ViewsData->get() (Line: 94)
Drupal\views\Plugin\Derivative\ViewsEntityRow->getDerivativeDefinitions() (Line: 101)
Drupal\Component\Plugin\Discovery\DerivativeDiscoveryDecorator->getDerivatives() (Line: 87)
Drupal\Component\Plugin\Discovery\DerivativeDiscoveryDecorator->getDefinitions() (Line: 337)
Drupal\Core\Plugin\DefaultPluginManager->findDefinitions() (Line: 213)
Drupal\Core\Plugin\DefaultPluginManager->getDefinitions() (Line: 153)
views_theme() (Line: 507)
Drupal\Core\Theme\Registry->processExtension() (Line: 400)
Drupal\Core\Theme\Registry->Drupal\Core\Theme\{closure}() (Line: 395)
Drupal\Core\Extension\ModuleHandler->invokeAllWith() (Line: 399)
Drupal\Core\Theme\Registry->build() (Line: 281)
Drupal\Core\Theme\Registry->get() (Line: 88)
Drupal\Core\Utility\ThemeRegistry->initializeRegistry() (Line: 69)
Drupal\Core\Utility\ThemeRegistry->__construct() (Line: 319)
Drupal\Core\Theme\Registry->getRuntime() (Line: 141)
Drupal\Core\Theme\ThemeManager->render() (Line: 490)
Drupal\Core\Render\Renderer->doRender() (Line: 248)
Drupal\Core\Render\Renderer->render() (Line: 153)
Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 637)
Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 152)
Drupal\Core\Render\Renderer->renderRoot() (Line: 66)
Drupal\Core\Render\BareHtmlPageRenderer->renderBarePage() (Line: 76)
Drupal\Core\ProxyClass\Render\BareHtmlPageRenderer->renderBarePage() (Line: 1085)
install_display_output() (Line: 160)
install_drupal() (Line: 53)