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DocIO error "Object reference not set to an instance of an object" on Linux Container

We are receiving an error when trying to convert some documents from DOC format to PDF format.  The process works with some docs, but not with others. 

This error does not occur in Windows only in Linux.

  I have attached a failing document to this ticket.  We are running the DocIO library in a Linux Docker container.  We are using:


SyncFusion.DocIORenderer.Net.Core  19.4.0.53

SkiaSharp.NativeAssets.Linux 2.80.3


This is the error stack trace:

--------------------------------------------------------------------------

Object reference not set to an instance of an object

at Syncfusion.Drawing.SkiaSharpHelper.Graphics.MeasureText(String text, String fontName, Single fontSize, FontStyle fontStyle, StringFormat format)

   at Syncfusion.Drawing.SkiaSharpHelper.Graphics.MeasureString(String text, Font font, PointF pointF, StringFormat format, FontStyle fontStyle)

   at Syncfusion.DocIO.Rendering.DrawingContext.MeasureString(String text, Font font, StringFormat format, WCharacterFormat charFormat, Boolean isMeasureFromTabList, Boolean isMeasureFromSmallCapString)

   at Syncfusion.DocIO.Rendering.DrawingContext.MeasureString(String text, Font font, StringFormat format, WCharacterFormat charFormat, Boolean isMeasureFromTabList)

   at Syncfusion.DocIO.DLS.WParagraph.LayoutParagraphInfoImpl.GetEmptyTextRangeSize()

   at Syncfusion.DocIO.DLS.WParagraph.LayoutParagraphInfoImpl..ctor(WParagraph paragraph)

   at Syncfusion.DocIO.DLS.WParagraph.CreateLayoutInfo()

   at Syncfusion.DocIO.DLS.WidgetBase.Syncfusion.Layouting.IWidget.get_LayoutInfo()

   at Syncfusion.Layouting.LCContainer.CreateNextChildContext()

   at Syncfusion.Layouting.LCContainer.Layout(RectangleF rect)

   at Syncfusion.Layouting.LCContainer.DoLayoutChild(LayoutContext childContext)

   at Syncfusion.Layouting.LCContainer.Layout(RectangleF rect)

   at Syncfusion.Layouting.Layouter.Layout(IWidgetContainer widget, ILayoutProcessHandler handler, DrawingContext dc)

   at Syncfusion.DocIO.DLS.Rendering.DocumentLayouter.LayoutPages()

   at Syncfusion.DocIO.DLS.Rendering.DocumentLayouter.Layout(IWordDocument doc)

   at Syncfusion.DocIORenderer.DocIORenderer.ConvertToPDF(WordDocument wordDocument)

   at DocumentConversionService.WordToPdfConverter.ConvertAsync(String bucketName, String sourceFileKey, String targetFileKey, String sourceFormat) in C:\\svc-doc-conversion\\src\\services\\WordToPdfConverter.cs:line 109

-------------------------------------------------------------


This is the code:


        using var wordDocument = new WordDocument(sourceStream, FormatType.Automatic);

        wordDocument.FontSettings.SubstituteFont += this.FontSettings_SubstituteFont;

        using var targetStream = new MemoryStream();

        using var render = new DocIORenderer();


        using var pdf = render.ConvertToPDF(wordDocument);


the error occurs in the ConfertToPDF method.


Thanks,

Joel