System.String Sage.Simply.Work.Repository.get_Func19() Error

I upgraded our sage .Net SDK to 2018.0. But now when I run our application and try to access sage data I get an exception: System.String Sage.Simply.Work.Repository.get_Func19()

on this line of code: 

SDKInstanceManager.Instance.SetAlertImplementation(new SageAutoAlertHandler());
var result = SDKInstanceManager.Instance.OpenDatabase(file,user,password,true,"Our App","OA",1);

The data file seems to open find in Sage 2017.2. Do I need to upgrade the file to 2018.0 before it will work?

Please help!!!