Hi,
I have a custom module I need to be searchable from DNN search.
So I have added a Controller class to my module that extends ModuleSearchBase with GetModifiedSearchDocuments method. I added the namespace in the module settings.
However since I added the namespace the module crashes and throws this exception the log:
Value cannot be null. Parameter name: type
InnerStackTrace:
in System.Activator.CreateInstance(Type type, Boolean nonPublic) in System.Activator.CreateInstance(Type type) in DotNetNuke.UI.Skins.Pane.IsVesionableModule(ModuleInfo moduleInfo) in DotNetNuke.UI.Skins.Pane.InjectModule(ModuleInfo module) in DotNetNuke.UI.Skins.Skin.InjectModule(Pane pane, ModuleInfo module)

this is my controller class:
 

    public class ListaController : ModuleSearchBase
    {
        public ListaController()
        {
        }

        public override IList GetModifiedSearchDocuments(ModuleInfo modInfo, DateTime beginDate)
        {
            var searchDocuments = new List();
            List docs = GetDocs();

            foreach (var doc in docs)
            {
                searchDocuments.Add(new SearchDocument
                {
                    Title = doc.Title,
                    Body = doc.Body,
                    ... and so on ...
                });
            }

            return searchDocuments;
        }
}

I think the problem is in the configuration side rather than code side.

DNN version is 9.4.0.

Can you help me? Thanks in advance!