IOM TypeInitializationException error with Login

I have been trying to use IOM on 11SP9 but I'm unable to get this code working...  
// url = "">myserver/InnovatorServer";
url = "">myserver/.../InnovatorServer.aspx";

var myConnection = IomFactory.CreateHttpServerConnection(url, db, user, password);
 var objItemRes = myConnection.Login();

if (objItemRes.isError())
 {
 MessageBox.Show("Login error " + objItemRes.dom.InnerText);
 }
It gives this error: 999 HTTP Error HttpServerConnection System.TypeInitializationException: The type initializer for 'Aras.Net.WindowsAuthenticationHelper' threw an exception.   My project is build on .NET 4.5.2 and I have referenced IOM.dll Version 11.0.0.6549 (1/19/2017)   What can be wrong?      
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