Trying to upload listing by flat file using Feed API - POST_FLAT_FILE_LISTINGS_DATA

[surbhi-ctas]

I am trying to create an Amazon Seller Central listing for a product using POST_FLAT_FILE_LISTINGS_DATA feed type. Although I got errors and I am unsure about the flat file format and details, I am sharing all the details with screenshots.

Since last two weeks, I haven't been able to upload flat files to Amazon, and I'm not aware of how many products we can upload in the same file at once. Could you please find a solution to this problem?

const feedType = 'POST_FLAT_FILE_LISTINGS_DATA'; // or 'POST_FLAT_FILE_INVLOADER_DATA'
const content = {
content: ${__dirname}/listing.csv,
contentType: 'text/csv; charset=UTF-8'
}

const feedUploadDetails = await sellingPartnerNewInstance.callAPI({
operation: 'feeds.createFeedDocument',
body: {
contentType: content.contentType
}
});
await sellingPartnerNewInstance
.upload(feedUploadDetails, content)
.then((res) => console.log(res))
.catch((err) => console.log(err));

const inputFeedDocumentId = feedUploadDetails.feedDocumentId;

let { feedId } = await sellingPartnerNewInstance
.callAPI({
operation: 'feeds.createFeed',
body: {
feedType,
marketplaceIds: ['A21TJRUUN4KGV'],
inputFeedDocumentId,
},
});

We successfully got feedId and download document reports, it generates error likes:

listing.csv file looks like:

Please revert back on this issue. Thank you very much!