Failure on deserializing XML elements

Question

Quite straights forward issue, but still can't figure out... I'm trying to deserialize XML which contains collection of XmlElements. I would like to deserialize the elements (First and second). The most important elements are the ones in the ImportantNode. The third is less important.

The failure is at the Deserialization method.

This is the xml:

<configuration>
  <objects>
        <!-- this is a comment -->  
         <First>
          <param name="Name" type="string">FirstName</param>
          <param name="Type" type="string">FirstType</param>
          <SomeElement>
               <SomeElement1>
                  <param name="Name" type="string">AAA</param>
                  <param name="Name2" type="string">BBB</param>
              </SomeElement1>
          </SomeElement>
          <param name="param1" type="string">1</param>
          <param name="param2" type="int">2</param>
          <param name="param3" type="float">3</param>
          <ImportantNode>
            <ImportantChildNode1>
              <param name="minValue" type="float">1</param>
              <param name="maxValue" type="float">100</param>
            </ImportantChildNode1>
            <ImportantChildNode2>
              <param name="minValue" type="float">1</param>
              <param name="maxValue" type="float">100</param>
            </IR>
        </ImportantNode>
        <elements>
          <element>
              <param name="paramName1" type="bool">true</param>
          </element>
        </elements>
      </First>
      <second>
          <param name="Name" type="string">2</param>
          <param name="Type" type="string">3</param>
          <ImportantNode>
            <ImportantChildNode1>
              <param name="minValue" type="float">2</param>
              <param name="maxValue" type="float">20</param>
            </ImportantChildNode1>
            <ImportantChildNode2>
              <param name="minValue" type="float">3</param>
              <param name="maxValue" type="float">30</param>
            </IR>
          </ImportantNode>
      </second>
      <third>
          <param name="Name" type="string">3</param>
          <param name="Type" type="string">4</param>
          <AAAA>
            <param name="DDD" type="string">XXX</param>
          </AAAA>
          <BBBB>
            <param name="DDD" type="string">ZZZ</param>
          </BBBB>
          <param name="Param1" type="string">6</param>
          <param name="Param2" type="string">301</param>
      </third>
    
    </objects>
</configuration>
  

This is the related classes:

[Serializable]
[XmlRoot(ElementName = "ImportantNode")]
public class ImportantNode
{
    [XmlElement(ElementName = "ImportantChildNode1")]
    public Param ImportantChildNode1Params { get; set; }
    [XmlElement(ElementName = "ImportantChildNode2")]
    public Param ImportantChildNode2Params { get; set; }
}

 public class Param
{
    [XmlAttribute(AttributeName = "name")]
    public string Name { get; set; }
    
    /*
    [XmlAttribute(AttributeName = "type")]
    public string type { get; set; }*/
    [XmlText]
    public string Value { get; set; }
}

[Serializable]
public class DeserializeObject
{
    [XmlArrayItem("param")]
    public List<Param> Params { get; set; }
    [XmlElement (ElementName ="ImportantNode")]
    public ImportantNode ImportantNodeParams { get; set; }
}

And this is the relevant code:

IEnumerable<DeserializeObject> DeserializeObjectsList;
XmlReaderSettings readSettings = new XmlReaderSettings();
readSettings.IgnoreComments = true;

string filePath = "<xml file path>";

//using (XmlReader reader = XmlReader.Create(filePath, readSettings)
XmlReader reader = XmlReader.Create(filePath, readSettings);
XmlDocument filedoc = new XmlDocument();
filedoc.Load(reader/*filePath*/);


//using var fileStream = new FileStream(filePath, FileMode.Open);
XmlNodeList xmlNodeList = filedoc["configuration"].GetElementsByTagName("objects");

if (xmlNodeList == null)
{
    throw new Exception("configuration file problem");
}
DeserializeObject dObject = new DeserializeObject();
XmlSerializer serializer = new XmlSerializer(dObject.GetType());

var objects = xmlNodeList[0].ChildNodes;

foreach (XmlElement object in objects)
{
    var sElement = object.InnerXml;
    //string AAA = sElement.ToString();
    StringReader SR = new StringReader(/*sElement.InnerXml*//*sElement*/object.OuterXml);
    var deserializedObject = serializer.Deserialize(SR);
    dObject = (DeserializeObject)serializer.Deserialize(SR);
}