System.Threading.Tasks error when trying to call API - vb.net

Question

I am new to vb.net code. I have to call external API from vb.net. I tried the code below but it is throwing an error - getting issue as
System.Threading.Tasks.k`1
Public Shared Async Function GetToken_saka() As Task(Of sakaweb)
Dim req As New HttpRequestMessage(HttpMethod.Post, "https://api.qa.se.com/token")
' req.Content = New FormUrlEncodedContent(New Dictionary < String, String > {
' {"client_id", "your client_id"},
' {"client_secret", "your client_secret"},
' {"grant_type", "client_credentials"}
'});
Dim dct As New Dictionary(Of String, String)
dct.Add("client_id", "your_client_id")
dct.Add("client_secret", "your_client_secret")
dct.Add("grant_type", "client_credentials")
Dim htc As New HttpClient
req.Content = New FormUrlEncodedContent(dct)
Dim response = Await htc.SendAsync(req)
response.EnsureSuccessStatusCode()
'Dim payload = JObject.Parse(Await response.Content.ReadAsStringAsync())
Dim payload = JsonConvert.DeserializeObject(response.ToString)
Dim token = payload.Value(Of String)("access_token")
Dim t1 As sakaweb = Nothing
Return t1
'Dim t1 As New Task("K")
'Return t1
End Function