Validation error messages from action?

CreateAction::make()
            ->label('New Sending Domain')
            ->color('purple')
            ->icon('heroicon-m-shield-check')
            ->modalWidth(Width::Medium)
            ->stickyModalFooter()
            ->stickyModalHeader()
            ->schema(SendingDomainFormSchema::makeForm())
            ->action(function (array $data, Action $action) {

                try {

                    $messages = [];

                    if (! empty($messages)) {
                        throw ValidationException::withMessages([
                            'domain' => 'Some error message',
                        ]);
                    }

                } catch (ValidationException $e) {

                    throw $e;
                } catch (Throwable $e) {

                    flashSweetAlert('Something went wrong while saving sending domain. Please try again.');

                    report($e); // optional but strongly recommended
                    $action->halt();
                }

                flashSweetAlert('Sending domain saved successfully.', 'success');

            });