generating a PPT file using a template with placeholders getting the error "getIndex() on null"

[arulselvan008]

public function generatePresentationAction()
{
$presentation = new PhpPresentation();
$productName = "NewProduct";
$sku = "Test01";

    $templatePath = '/home/pim_svc/b.pptx';
    $templatePresentation = IOFactory::createReader('PowerPoint2007')->load($templatePath);
    $masterSlides = $templatePresentation->getAllMasterSlides();
    foreach ($masterSlides as $masterSlide) {
        $slideLayouts = $masterSlide->getAllSlideLayouts();
        
        foreach ($slideLayouts as $slideLayout) {
            $slide = new Slide();
            $slide->setShapeCollection($slideLayout->getShapeCollection());
            $presentation->addSlide($slide);
            $shapes = $slide->getShapeCollection();
            foreach ($shapes as $shape) {
                if ($shape instanceof RichText) {
                    $text = $shape->getPlainText();

b.pptx

                    if (stripos($text, 'PRODUCTNAME')!== false) {
                        $shape->getActiveParagraph()->getRichTextElements()[0]->setText(str_replace('PRODUCTNAME', $productName, $text));
                    }
                    // if (stripos($text, 'SKU')!== false) {
                    //     $shape->getActiveParagraph()->getRichTextElements()[0]->setText(str_replace('SKU', $sku, $text));
                    // }
                }
            }
        }
    }
    
    $filename = "newOutPUT".'.pptx';
    // $tmpFilename = sys_get_temp_dir(). '/'. $filename;
    $writer = IOFactory::createWriter($presentation, 'PowerPoint2007');
    $writer->save($filename);
    
    $response = new BinaryFileResponse($tmpFilename);
    $response->setContentDisposition(ResponseHeaderBag::DISPOSITION_ATTACHMENT, $filename);

    return $response;
}

For your reference my code above, I am trying to generate a PPT file based on a sample template with placeholders, but I am getting an error: "Call to a member function getIndex() on null." How can I fix this? Can anyone help me resolve this issue?

b.pptx

[arulselvan008]

Hi, does anyone have an idea about these queries? Please help us resolve the issue.