1	<?php
2
3	declare(strict_types=1);
4
5	namespace Drupal\display_builder\Exception;
6
7	/**
8	* Thrown when a tree operation targets a node that does not exist or invalid.
9	*
10	* Examples: attaching to a parent slot that cannot be found, or a node ID
11	* mismatch detected during a source update.
12	*
13	* Extends \RuntimeException so callers can catch it selectively without
14	* catching all possible exceptions.
15	*/
16	final class InvalidNodeException extends \RuntimeException {
17
18	}

---

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