Return always empty

[Paragliderbe]

Hello,
I'm trying to use the LibreTranslate API but without success. The return is always empty. I don't have a key because I use it occasionally and the API is free when you use it little.
What is the code missing to make it work?
Thank you for your reply

`
Try

        Dim LibreTranslate = New LibreTranslate.Net.LibreTranslate
        Dim SupportedLanguages As System.Collections.Generic.IEnumerable(Of SupportedLanguages) = Await LibreTranslate.GetSupportedLanguagesAsync()
        'System.Console.WriteLine(Newtonsoft.Json.JsonConvert.SerializeObject(SupportedLanguages, Newtonsoft.Json.Formatting.Indented))
        Dim frenchText = "Hello World!"
        Dim spanishText As String = Await LibreTranslate.TranslateAsync(New Translate() With {
                    .Source = LanguageCode.English,
                    .Target = LanguageCode.Spanish,
                    .Text = frenchText
                    
})
        Debug.Print(spanishText)

    Catch ex As Exception
        Debug.Print(ex.Message)
    End Try

`
Try

        Dim LibreTranslate = New LibreTranslate.Net.LibreTranslate
        Dim SupportedLanguages As System.Collections.Generic.IEnumerable(Of SupportedLanguages) = Await LibreTranslate.GetSupportedLanguagesAsync()
        'System.Console.WriteLine(Newtonsoft.Json.JsonConvert.SerializeObject(SupportedLanguages, Newtonsoft.Json.Formatting.Indented))
        Dim frenchText = "Hello World!"
        Dim spanishText As String = Await LibreTranslate.TranslateAsync(New Translate() With {
                    .Source = LanguageCode.English,
                    .Target = LanguageCode.Spanish,
                    .Text = frenchText
                    
})
        Debug.Print(spanishText)

    Catch ex As Exception
        Debug.Print(ex.Message)
    End Try