Script doesn't open when changing webelement action

[darkranjha]

Whenever I create actions and run, things work fine. But if I want to change the find element by id to something else and then click save and run, I get an error immediately. Object not set to an instance of an object. If I do the same thing by editing the original xml without using the tool, then the script will load fine.

[darkranjha]

Here is some additional info after doing some preliminary debugging:

System.NullReferenceException: 'Object reference not set to an instance of an object.'

System.Xml.Linq.XContainer.Element(...) returned null.

code that is getting the error is bolded below (first line under // xs:sequence):

    private static (XElement, XElement, string, XElement, List<XElement>) GetTable(XElement elem, string tableParameterName)
    {
        XNamespace nsXs = "http://www.w3.org/2001/XMLSchema";
        XNamespace nsMsdata = "urn:schemas-microsoft-com:xml-msdata";

        var el = elem.Element(tableParameterName);
        var elel = el.Element(nsXs + "schema").Element(nsXs + "element");

        // table name
        var rowName = elel.Attribute("name").Value;
        if (rowName == "NewDataSet")
        {
            rowName = elel.Attribute(nsMsdata + "MainDataTable")?.Value;
        }
        
        // xs:sequence
        ### This is the code that it chokes on **_var seq = elel.Element(nsXs + "complexType").Element(nsXs + "choice").Element(nsXs + "element").Element(nsXs + "complexType").Element(nsXs + "sequence");_**


        // table, diffgram
        XNamespace nsDiffgram = "urn:schemas-microsoft-com:xml-diffgram-v1";
        var baseElem = el.Element(nsDiffgram + "diffgram");
        return (
            baseElem.Element("DocumentElement"),
            baseElem.Element(nsDiffgram + "before"),
            rowName,
            baseElem,
            seq.Elements()?.ToList() ?? new List<XElement>()
        );
    }