Error when trying to use custom paper size

Since I didn't find a paper size that matched my need here: https://github.com/rdvojmoc/DinkToPdf/blob/b0546d21641eaef71f6fe0ddfd3998e8502baab7/src/DinkToPdf/Utils/PaperKind.cs

I'm trying to use the value "PaperKind.Custom" in the "GlobalSettings" object, however I get the following error stack:

ex.Message: "The given key 'Custom' was not present in the dictionary."
ex.Source: "System.Private.CoreLib"
ex.StackTrace: "at System.ThrowHelper.ThrowKeyNotFoundException[T](T key)
    at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
    at DinkToPdf.PechkinPaperSize.op_Implicit(PaperKind paperKind)
    at api.mstiDFE.Domain.PDF.Servicos.PDFService.<Create>d__2.MoveNext() 
    in C:\Users\Source\Workspace\api.mstiDFE\api.mstiDFE\Domain\PDF\Servicos\PDFService.cs:line 26"

I know I must be doing something wrong. So what would be the correct procedure for specifying a custom paper width, (in my case 80mm)?

The code I am using to generate the pdf:

byte[] file = null;
try
    {
        var globalSettings = new GlobalSettings
        {
            ColorMode = ColorMode.Color,
            Orientation = Orientation.Portrait,
            PaperSize = PaperKind.Custom; //<=PROBLEM HERE,
            Margins = new MarginSettings() { Top = MarginTop, Bottom = MarginBottom, Left = MarginLeft, Right = MarginRight },
            DocumentTitle = "Simple PDF document",
        };

        var objectSettings = new ObjectSettings
        {
            PagesCount = true,
            HtmlContent = templateHtml,
            WebSettings = { DefaultEncoding = "utf-8", EnableJavascript = true },
        };
        var pdf = new HtmlToPdfDocument()
        {
            GlobalSettings = globalSettings,
            Objects = { objectSettings }
        };

        file = _pdfConverter.Convert(pdf);
    }
    catch (Exception ex)
    {
        throw ex;
    }

    return file;

Any tip, will be much appreciated. Thanks!

rdvojmoc / DinkToPdf

Error when trying to use custom paper size #107