Good Morning,

We upgraded a site to DNN 7.x this week and a custom module is now throwing the following error:

 DotNetNuke.Services.Exceptions.ModuleLoadException: Value cannot be null. Parameter name: source ---> System.ArgumentNullException: Value cannot be null. Parameter name: source at System.Linq.Enumerable.Where[TSource](IEnumerable`1 source, Func`2 predicate) at Find8.DNN.DiplomateManager.Components.DiplomateController.DiplomateCertifiedInfo(Int32 portalid, Int32 userid) at Find8.DNN.DiplomateManager.ProfileView.bindUserInfo() at Find8.DNN.DiplomateManager.ProfileView.Page_Load(Object sender, EventArgs e) --- End of inner exception stack trace ---

The module does you an Entity data model and it appears that the parameter name is null.  However, I need a better understanding of where to look in the module, what to fix etc. so that I can get the site on it's way.  Your expeditious help and guidance is appreciated.

Thanks,

Sid

based on your error it's suggests the problem is populating some user data (bindUserInfo) - as most user data is stored in core tables (such as users/useroles etc.), I would guess that your entity model is linking to these core tables (entities) and that a change to one of those has caused your issue. This is the same as a 3rd party module doing direct database access - and we do not support this i.e. we do not guarantee our database will stay the same always (we guarantee that our API will be backwards compatible so using methods such as UserController methods will always work where as "select [columnname] from users" may not). You could try regenerating your entity model to see what happens (or even running sql profiler to see if there is a failing query based on the model), but the best option is what Richard suggested.

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hard to tell - that's likely a namespacing issue i.e. you've created a new solution but it doesn't have the same namespace as the old one . As for a better way, using the DNN API is better than direct access i.e. you could use something such as arrUsers = UserController.GetUsers(PortalId) to get a list of users (or just bind them directly to a control such as a dropdownlist)

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