Error with OAuth1.0 Authentication

[DLHeinze]

I'm trying to use OAuth1.0 to authenticate to an API. I am getting an error when it's preparing the http request.

The code is very simple. It builds just fine until I add the authentication part.

Any ideas?

ERROR - WebClient.Execute: -2147210493 (11011 / 80042b03), An error occurred during execute
-2147210492 (80042b04): An error occurred while preparing http request
-2146232576 (80131700): Automation error

Function Get_SingleRecord() As String
    Dim Client As New WebClient
    Client.BaseUrl = kBaseURL & "/"

    ' Setup authenticator
    Dim Auth As New OAuth1Authenticator
    Auth.Setup _
        ConsumerKey:=kconsumer_key, _
        ConsumerSecret:=kconsumer_secret, _
        Token:=koauth_token, _
        TokenSecret:=koauth_token_secret
    Set Client.Authenticator = Auth

    ' Use GetJSON helper to execute simple request and work with response
    Dim Resource As String
    Dim Response As WebResponse
    Resource = "restapi/1.0/object/contact/3"
    Set Response = Client.GetJson(Resource)
End Function

[DLHeinze]

The error was at this line:
Set web_Crypto = CreateObject("System.Security.Cryptography.HMACSHA1")

Solution:
Installed MS .NET Framework 3.5