Google App Script to create a doc with speaker notes from slides

SlidesToDoc.gs

var INPUT_PRESO_ID = "<id>";
var OUTPUT_DOC_ID = "<id>";

function createNotesDoc() {
  var presentation = Slides.Presentations.get(INPUT_PRESO_ID)
  var out = DocumentApp.openById(OUTPUT_DOC_ID)
  out.getBody().clear();
  table = out.getBody().appendTable();
  var links = [];
  for (var i = 0; i < presentation.slides.length; i++) {
    Logger.log("Exporting page " + (i + 1) + "/" + presentation.slides.length);
    var slide = presentation.slides[i];
    var text = slide.slideProperties.notesPage.pageElements[1].shape.text;
    var row = table.appendTableRow();
    var url = "https://docs.google.com/presentation/d/" + INPUT_PRESO_ID + "/export/png?id=" + INPUT_PRESO_ID + "&pageid=" + slide.objectId;
    var imageCell = row.appendTableCell();
    imageCell.removeChild(imageCell.getChild(0)); // remove empty first paragraph
    imageCell.appendImage(UrlFetchApp.fetch(url).getBlob()).setWidth(160).setHeight(90);
    var noteCell = row.appendTableCell();
    noteCell.removeChild(noteCell.getChild(0)); // remove empty first paragraph
    table.setColumnWidth(0, 140);
    var noteParagraph = noteCell.appendParagraph("");
    if (text) {
      var textElements = text.textElements;
      var fullContent = "";
      for (var j = 0; j < textElements.length; j++) {
        if (textElements[j].textRun) {
          fullContent += textElements[j].textRun.content;
        }
      }
      if (fullContent.trim()) {
        noteParagraph.appendText(fullContent.trim());
      }
    }
  }
}

Hello,
thank you for sharing your code. I'm trying to use your script but getting following error message.

Exception: Invalid image data.

If I comment out the section about image all works fine. So maybe there is any new update in app script reg images? Or should I include any other service in appscript?

Thank for your help

Jan