ERror using xml AppendChild

I am getting "The current node cannot contain other nodes." on the AppendChild.
What am I doing wrong?  MainDoc contains valid xml.  I am just trying to add an error message at the end of it.
element = errDoc.CreateElement("myError")
element.InnerXml = "<ErrorMsg>" & Msg & "</ErrorMsg>" & _
                   "<Exception>" & exception & "</Exception>"
errDoc.AppendChild(element)
MainDoc = errDoc.OuterXml

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ToolTimeGangAsked:
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Robert SchuttSoftware EngineerCommented:
Try changing line 4 to:
errDoc.DocumentElement.AppendChild(element)

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ToolTimeGangAuthor Commented:
Robert....it worked like a charm!  Thank you!  
This code has been recompiled from .NET 1.1 to .NET 4.5.
So I guess I can expect deprecated things like this as I continue my journey through these recompiles ey?
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Robert SchuttSoftware EngineerCommented:
I'm not really sure, for your sake I hope not! To be honest I wasn't aware this has ever been possible (in this situation), thought I recognized a mistake I have made myself as far back as VB6. I guess it depends more on the object used than the specific language though. If it has been possible then I would say it was added in spite of the standard. Adding a second root element to the document should not be possible. Within its document element however not a problem.
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