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[Very desperate] readxml column already belongs to this DataTable

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Post time: 2020-3-5 20:00:02
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DataSet ds = new DataSet ();
 ds.ReadXml ("http://www.cnblogs.com/dudu/Rss.aspx");

"The column already belongs to this DataTable" when reading the xml file with the above statement
How to solve this problem?
Thank you.
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Post time: 2020-5-20 22:15:02
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Are the column names duplicated?
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Post time: 2020-5-21 17:45:01
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Open and look at the XML file, there should be a duplicate name column
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 Author| Post time: 2020-5-24 03:00:01
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How to solve it?
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