无法运行 Azure 表单识别器布局 _ 遇到意外的元素引用

Question

I try to use azure form recognizer layout to parse data and got issue. It can success run for some forms but some cases it will shown error "Unexpected element reference encountered: #/readResults/0/selectionMarks/0". Im not sure is that a bug or something wrong with my code. Can someone advice? Bellow is the code im using:

 router.post("/concinv", upload.single("form_file"), async (req, res, next) => {
  const endpoint = process.env.AZURE_ENDPOINT;
  const apiKey = process.env.AZURE_API_KEY;
  let file = req.file;
  const file_name = file.filename;

  if (!file_name) {
    return res.status(400).json("No files were uploaded.");
  }
  try {
    const uploadPath = path.join(__dirname, "../../../" + req.file.path);

    const readStream = fs.createReadStream(uploadPath);
    const client = new FormRecognizerClient(
      endpoint,
      new AzureKeyCredential(apiKey)
    );   

    const pollerLayout = await client.beginRecognizeContent(readStream, {
      contentType: "application/pdf",
      onProgress: (state) => {
        console.log(`status of DO: ${state.status}`);
      },
    });
    const layouts = await pollerLayout.pollUntilDone();    

    return ServiceResponse.Ok(res, {
      Items: layouts,
    });
  } catch (error) {
    return ServiceResponse.BadRequest(res, { err: error.message });
  }
});

Answer 1

From the error message it seems some of your documents don't have selection mark hence the reference failed. Can you please double check?