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Title Object type File name Summary
Messenger::addError function core/lib/Drupal/Core/Messenger/Messenger.php Adds a new error message to the queue.
MessengerInterface::addError function core/lib/Drupal/Core/Messenger/MessengerInterface.php Adds a new error message to the queue.
PreOperationStageEvent::addError function core/modules/package_manager/src/Event/PreOperationStageEvent.php Convenience method to flag a validation error.
PreOperationStageEvent::addErrorFromThrowable function core/modules/package_manager/src/Event/PreOperationStageEvent.php Convenience method, adds an error validation result from a throwable.

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