Ошибка преобразования SVG-файла в PNG с Imagick

Я пытаюсь преобразовать SVG-файл (который содержит диаграмму) в PNG-файл, используя Imagick, но я получаю следующую ошибку:

Fatal error: Uncaught exception 'ImagickException' with message 'no decode delegate for this image format `' @ error/blob.c/BlobToImage/346

Код:

$chart = '1201900945.svg';
$image = new Imagick();
$image->setBackgroundColor(new ImagickPixel('transparent'));
$image->readImageBlob($chart);
$image->setImageFormat("png24");
//$image->resizeImage(1024, 768, imagick::FILTER_LANCZOS, 1);
$image->writeImage('svgtmp/image22.png');

Мой SVG-файл содержит простой Apple Draw SVG, который должен быть преобразован в PNG с помощью кода выше, но он возвращает мне ошибку, о которой я упоминал выше:

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Что вызывает эту ошибку?