protected function error_to_response( $error ) {
		$error_data = $error->get_error_data();

		if ( is_array( $error_data ) && isset( $error_data['status'] ) ) {
			$status = $error_data['status'];
		} else {
			$status = 500;
		}

		$errors = array();

		foreach ( (array) $error->errors as $code => $messages ) {
			foreach ( (array) $messages as $message ) {
				$errors[] = array(
					'code'    => $code,
					'message' => $message,
					'data'    => $error->get_error_data( $code ),
				);
			}
		}

		$data = $errors[0];
		if ( count( $errors ) > 1 ) {
			// Remove the primary error.
			array_shift( $errors );
			$data['additional_errors'] = $errors;
		}

		$response = new WP_REST_Response( $data, $status );

		return $response;
	}