'SiteProperties' does not contain a definition for 'HidePeoplePreviewingFiles' and no accessible extension method 'HidePeoplePreviewingFiles' accepting a first argument of type 'SiteProperties' could be found (are you missing a using directive or an assembly reference?)

Process completed with exit code 1.

'InvalidOperationException.InvalidOperationException(SerializationInfo, StreamingContext)' is obsolete: 'This API supports obsolete formatter-based serialization. It should not be called or extended by application code.' (https://aka.ms/dotnet-warnings/SYSLIB0051)