ios – Swift CSV import fails with ‘Didn’t load flashcards: ERR257.DFU’ — doable encoding or parsing difficulty?

I’m engaged on importing flashcards from a CSV file in my Swift app. I exploit the next methodology to generate and write the CSV file:

func generateCSVText(withManagedObjects arrManagedObject: [Flashcard]) {
    var CSVString = "reply, questionn"

    for flashcard in arrManagedObject {
        let entityContent = ""(flashcard.flashcardAnswer)", "(flashcard.flashcardQuestion)"n"
        CSVString.append(entityContent)
    }

    let tempDirectory = FileManager.default.temporaryDirectory
    let fileURL = tempDirectory.appendingPathComponent("(cardSet.cardSetName).csv")

    do {
        attempt CSVString.write(to: fileURL, atomically: true, encoding: .utf8)
        DispatchQueue.principal.async {
            self.csvFileURL = fileURL
        }
        self.isShowingExportView = true
    } catch {
        print("Error writing CSV: (error.localizedDescription)")
    }
}

Then I try and import it utilizing:

func importFlashcards(from fileURL: URL) {
    do {
        let content material = attempt String(contentsOf: fileURL, encoding: .utf8)
        let rows = content material.parts(separatedBy: "n").dropFirst() // Skip header

        for row in rows {
            let trimmed = row.trimmingCharacters(in: .whitespacesAndNewlines)
            guard !trimmed.isEmpty else { proceed }

            var parts = trimmed.parts(separatedBy: "", "")
            if parts.depend == 2 {
                // Take away surrounding quotes
                var reply = parts[0]
                var query = parts[1]

                if reply.hasPrefix(""") { reply.removeFirst() }
                if query.hasSuffix(""") { query.removeLast() }

                dataController.newFlashcard(reply: reply, query: query)
            }
        }
    } catch {
        print("Didn't load flashcards: (error.localizedDescription)")
    }
}

Nonetheless, after I choose the file for import, I get the next error:

Didn't load flashcards: ERR257.DFU

I additionally opened the CSV in a web based CSV editor and viewer, chosen “UTF-8” encoding there, and it displayed/edited simply positive.