When using these settings:

HtmlToPdfOptions options = new HtmlToPdfOptions();
var pageMargin = 0.5;

var defaultSize = EO.Pdf.PdfPageSizes.A4;
options.PageSize = defaultSize;
options.OutputArea = EO.Pdf.HtmlToPdf.Options.OutputArea = new System.Drawing.RectangleF(
pageMargin,
pageMargin,
(float)(defaultSize.Width - (pageMargin * 2)),
(float)(defaultSize.Height - (pageMargin * 2))
);

options.TriggerMode = EO.Pdf.HtmlToPdfTriggerMode.Dual;
options.MaxLoadWaitTime = 6000;
options.UserName = "theusername";
options.Password = "thepassword";

EO.Pdf.HtmlToPdf.ConvertUrl("url", doc, options);
I am receiving the following exception


Message: Object reference not set to an instance of an object.
Source: EO.Pdf
StackTrace: at EO.Pdf.Internal.lp.a(Object A_0, ThreadExceptionEventArgs A_1)
at System.Windows.Forms.Application.ThreadContext.OnThreadException(Exception t)
at System.Windows.Forms.Control.WndProcException(Exception e)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


TargetSite: {Void a(System.Object, System.Threading.ThreadExceptionEventArgs)} System.Reflection.MethodBase {System.Reflection.RuntimeMethodInfo}

Hi,

4.0.50.2 is the same as 2012.0.50. Please try to isolate the problem into a test project and then send the test project to us. Once we have that we will debug into it and see what we can find.

Thanks!