Nullability of type of parameter 'obj' doesn't match overridden member (possibly because of nullability attributes).

Converting null literal or possible null value to non-nullable type.

Possible null reference argument for parameter 'stream' in 'StreamReader.StreamReader(Stream stream)'.

Nullability of type of parameter 'obj' doesn't match overridden member (possibly because of nullability attributes).

Converting null literal or possible null value to non-nullable type.

Possible null reference argument for parameter 'stream' in 'StreamReader.StreamReader(Stream stream)'.

Dereference of a possibly null reference.

Possible null reference argument for parameter 'rootXmlNode' in 'void Extensions.TraverseXml(XmlNode rootXmlNode, Action<XmlNode> action)'.

Converting null literal or possible null value to non-nullable type.