Why do I get this error with openxml?

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C#

OpenXML

I'm trying to create a table in a Word Document using OpenXML in C#. The code I'm using to create the table is:

using (WordprocessingDocument doc = WordprocessingDocument.Open(fileName, true))
{
    Table table = new Table();

    TableProperties tblProp = new TableProperties(
        new TableBorders(
            new TopBorder()
            {
                Val = new EnumValue<BorderValues>(BorderValues.Dashed),
                Size = 24
            },
            new BottomBorder()
            {
                Val = new EnumValue<BorderValues>(BorderValues.Dashed),
                Size = 24
            },
            new LeftBorder()
            {
                Val = new EnumValue<BorderValues>(BorderValues.Dashed),
                Size = 24
            },
            new RightBorder()
            {
                Val = new EnumValue<BorderValues>(BorderValues.Dashed),
                Size = 24
            },
            new InsideHorizontalBorder()
            {
                Val = new EnumValue<BorderValues>(BorderValues.Dashed),
                Size = 24
            },
            new InsideVerticalBorder()
            {
                Val = new EnumValue<BorderValues>(BorderValues.Dashed),
                Size = 24
            }
        )
    );

    // Append the TableProperties object to the empty table.
    table.AppendChild<TableProperties>(tblProp);

    for (int i = 0; i < 6; i++)
    {
        // Create a Header row.
        TableRow tr = new TableRow();
        for (int j = 0; j < 6; j++)
        {
            // Create Cell
            TableCell tc = new TableCell(new Paragraph(new Run(new Text { Text = ""})));
            tr.Append(tc);
        }
        table.Append(tr);
        Debug.Print(table.OuterXml);
    } 
    doc.MainDocumentPart.Document
        .Body.Append(table);
    doc.Save();

The result of the Debug.Print(table.OuterXml) is:

<w:tbl xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main">
	<w:tblPr>
		<w:tblBorders>
			<w:top w:val="dashed" w:sz="24"/>
			<w:bottom w:val="dashed" w:sz="24"/>
			<w:left w:val="dashed" w:sz="24"/>
			<w:right w:val="dashed" w:sz="24"/>
			<w:insideH w:val="dashed" w:sz="24"/>
			<w:insideV w:val="dashed" w:sz="24"/>
		</w:tblBorders>
	</w:tblPr>
	<w:tr>
		<w:tc>
			<w:p>
				<w:r>
					<w:t/>
				</w:r>
			</w:p>
		</w:tc>
		<w:tc>
			<w:p>
				<w:r>
					<w:t/>
				</w:r>
			</w:p>
		</w:tc>
		<w:tc>
			<w:p>
				<w:r>
					<w:t/>
				</w:r>
			</w:p>
		</w:tc>
		<w:tc>
			<w:p>
				<w:r>
					<w:t/>
				</w:r>
			</w:p>
		</w:tc>
		<w:tc>
			<w:p>
				<w:r>
					<w:t/>
				</w:r>
			</w:p>
		</w:tc>
	</w:tr>
	<w:tr>
		<w:tc>
			<w:p>
				<w:r>
					<w:t/>
				</w:r>
			</w:p>
		</w:tc>
		<w:tc>
			<w:p>
				<w:r>
					<w:t/>
				</w:r>
			</w:p>
		</w:tc>
		<w:tc>
			<w:p>
				<w:r>
					<w:t/>
				</w:r>
			</w:p>
		</w:tc>
		<w:tc>
			<w:p>
				<w:r>
					<w:t/>
				</w:r>
			</w:p>
		</w:tc>
		<w:tc>
			<w:p>
				<w:r>
					<w:t/>
				</w:r>
			</w:p>
		</w:tc>
	</w:tr>
	<w:tr>
		<w:tc>
			<w:p>
				<w:r>
					<w:t/>
				</w:r>
			</w:p>
		</w:tc>
		<w:tc>
			<w:p>
				<w:r>
					<w:t/>
				</w:r>
			</w:p>
		</w:tc>
		<w:tc>
			<w:p>
				<w:r>
					<w:t/>
				</w:r>
			</w:p>
		</w:tc>
		<w:tc>
			<w:p>
				<w:r>
					<w:t/>
				</w:r>
			</w:p>
		</w:tc>
		<w:tc>
			<w:p>
				<w:r>
					<w:t/>
				</w:r>
			</w:p>
		</w:tc>
	</w:tr>
	<w:tr>
		<w:tc>
			<w:p>
				<w:r>
					<w:t/>
				</w:r>
			</w:p>
		</w:tc>
		<w:tc>
			<w:p>
				<w:r>
					<w:t/>
				</w:r>
			</w:p>
		</w:tc>
		<w:tc>
			<w:p>
				<w:r>
					<w:t/>
				</w:r>
			</w:p>
		</w:tc>
		<w:tc>
			<w:p>
				<w:r>
					<w:t/>
				</w:r>
			</w:p>
		</w:tc>
		<w:tc>
			<w:p>
				<w:r>
					<w:t/>
				</w:r>
			</w:p>
		</w:tc>
	</w:tr>
</w:tbl>

Which looks ship-shape and Bristol fashion.

On the next line when I attempt to append the table to the document using doc.MainDocumentPart.Document.Body.Append(table);. But I get the following error:

System.Xml.XmlException
  HResult=0x80131940
  Message=Unexpected end of file has occurred. The following elements are not closed: w:tr, w:tbl, w:body, w:document. Line 1, position 3232.

  This exception was originally thrown at this call stack:
    System.Xml.XmlTextReaderImpl.Throw(System.Exception)

The error is strange. I get the Line 1 but where is position 3232? The XML above is a result of pasting the debug print into Notepad++ and choosing the Pretty Print function so can't be relied on for positions and lines. The linearized XML has only 1 line only 1219 positions. Does anyone know what's going on here?

What I have tried:

using (WordprocessingDocument doc = WordprocessingDocument.Open(fileName, true))
{
    Table table = new Table();

    TableProperties tblProp = new TableProperties(
        new TableBorders(
            new TopBorder()
            {
                Val = new EnumValue<BorderValues>(BorderValues.Dashed),
                Size = 24
            },
            new BottomBorder()
            {
                Val = new EnumValue<BorderValues>(BorderValues.Dashed),
                Size = 24
            },
            new LeftBorder()
            {
                Val = new EnumValue<BorderValues>(BorderValues.Dashed),
                Size = 24
            },
            new RightBorder()
            {
                Val = new EnumValue<BorderValues>(BorderValues.Dashed),
                Size = 24
            },
            new InsideHorizontalBorder()
            {
                Val = new EnumValue<BorderValues>(BorderValues.Dashed),
                Size = 24
            },
            new InsideVerticalBorder()
            {
                Val = new EnumValue<BorderValues>(BorderValues.Dashed),
                Size = 24
            }
        )
    );

    // Append the TableProperties object to the empty table.
    table.AppendChild<TableProperties>(tblProp);

    for (int i = 0; i < 6; i++)
    {
        // Create a Header row.
        TableRow tr = new TableRow();
        for (int j = 0; j < 6; j++)
        {
            // Create Cell
            TableCell tc = new TableCell(new Paragraph(new Run(new Text { Text = ""})));
            tr.Append(tc);
        }
        table.Append(tr);
        Debug.Print(table.OuterXml);
    } 
    doc.MainDocumentPart.Document
        .Body.Append(table);
    doc.Save();