System.NullReferenceException: Object reference not set to an instance of an object. at WW.Cad.Model.DxfModel.GetFallbackTrueTypeFontFilename(FontStyle fontStyle) at ?.?(String ?, Boolean ?, Boolean ?, FontFamily& ?, FontStyle& ?, ?& ?) at ?.?..ctor(String ?, Boolean ?, Boolean ?) at ?.?(String ?, Boolean ?, Boolean ?) at ?.get_?() at ?..ctor(? ?) at ?.?(String ?, Double ?, Double ?, AttachmentPoint ?, Double ?, LineSpacingStyle ?, DxfTextStyle ?, Double ?, Color ?, DrawingDirection ?, String& ?) at ?.?(String ?, Double ?, Double ?, AttachmentPoint ?, Double ?, LineSpacingStyle ?, DxfTextStyle ?, Double ?, Color ?, DrawingDirection ?, Int16 ?, Matrix4D ?, ? ?, ? ?) at ?.?(DxfModel ?, DxfMText ?, Color ?, Int16 ?, Matrix4D ?, Bounds2D ?) at WW.Cad.Model.Entities.DxfMText.?(DrawContext ?, IPathDrawer ?) at WW.Cad.Model.Entities.DxfMText.DrawInternal(Wireframe context, IWireframeGraphicsFactory graphicsFactory) at WW.Cad.Model.Entities.DxfEntity.Draw(Wireframe context, IWireframeGraphicsFactory graphicsFactory) at WW.Cad.Drawing.BoundsCalculator.GetBounds(DxfModel model, Matrix4D modelTransform) at WW.Cad.Drawing.BoundsCalculator.GetBounds(DxfModel model)