[BUG] Adding 2sxc Content module results with Error: System.ArgumentNullException

[tvatavuk]

Bug Affects...

• edit experience / UI
• admin experience / UI
• Platform parts (Oqtane)
• other / unknown

Current Behavior / Expected Behavior

Adding 2sxc Content module results with Error: System.ArgumentNullException

Error:

System.ArgumentNullException: Value cannot be null. (Parameter 'collection')
   at System.Collections.Generic.List`1.AddRange(IEnumerable`1 collection)
   at ToSic.Eav.Apps.Services.AppDataStackService.GetStack(AppThingsIdentifiers target, IEntity viewPart)
   at ToSic.Eav.Apps.Services.AppDataStackService.GetStack(String part, IEntity viewPart)
   at ToSic.Eav.Context.Internal.ContextOfApp.<get_AppSettings>b__22_0()
   at ToSic.Lib.Helpers.GetOnce`1.Get(Func`1 generator)
   at ToSic.Eav.Context.Internal.ContextOfApp.get_AppSettings()
   at ToSic.Sxc.LookUp.Internal.SxcAppDataConfigProvider.GetLookupEngineForContext(IContextOfSite context, IApp appForLookup, IBlock blockForLookupOrNull)
   at ToSic.Sxc.LookUp.Internal.SxcAppDataConfigProvider.GetDataConfiguration(EavApp app, AppDataConfigSpecs specs)
   at ToSic.Eav.Apps.Internal.EavApp.<get_AppDataConfig>b__22_0()
   at ToSic.Lib.Helpers.GetOnce`1.Get(Func`1 generator)
   at ToSic.Eav.Apps.Internal.EavApp.get_AppDataConfig()
   at ToSic.Eav.Apps.Internal.EavApp.<get_ConfigurationProvider>b__19_0()
   at ToSic.Lib.Helpers.GetOnce`1.Get(Func`1 generator)
   at ToSic.Eav.Apps.Internal.EavApp.get_ConfigurationProvider()
   at ToSic.Eav.Apps.Internal.EavApp.BuildData[TDataSource,TResult]()
   at ToSic.Eav.Apps.Internal.EavApp.get_Data()
   at ToSic.Sxc.Web.Internal.JsContext.JsContextAll.GetJsContext(String systemRootUrl, IBlock block, String errorCode, List`1 exsOrNull, RenderStatistics statistics)
   at ToSic.Sxc.Blocks.Internal.Render.RenderingHelper.ContextAttributes(Int32 instanceId, Int32 contentBlockId, Boolean includeEditInfos, Boolean includeJsApiContext, String errorCode, List`1 exsOrNull, RenderStatistics statistics)
   at ToSic.Sxc.Blocks.Internal.Render.RenderingHelper.WrapInContext(String content, NoParamOrder noParamOrder, Int32 instanceId, Int32 contentBlockId, Boolean editContext, Boolean jsApiContext, String tag, Boolean addLineBreaks, String errorCode, List`1 exsOrNull, RenderStatistics statistics)
   at ToSic.Sxc.Blocks.Internal.BlockBuilder.RenderInternal(RenderSpecs specs)

Expected Behavior: Adding the module should successfully initialize the content module without throwing an exception.

To Reproduce (Steps, Videos, Screenshots, Apps)

1. Using Oqtane 6.1.0 with the latest net9.0 and installing the latest 2sxc (19.03.01)
2. Add the 2sxc Content module to a page
3. Observe the error: "System.ArgumentNullException: Value cannot be null."

Your environment

• 2sxc version(s): 19.03.01
• Browser: all
• DNN / Oqtane: Oqtane 6.1.0
• Hosting platform: all
• Ui Languages: any/all

Additional context

There are other 2sxc variations of the same issue that may result in different exceptions. For example:

• Adding the APP module results in a 400 (Bad Request) on the api/sxc/cms/block/Apps?apps= endpoint.

This error happens when using <LangVersion>preview</LangVersion> with EFCore 9.0.x.

Core issue appears related to:

• First-class span support causes translation failure with Contains dotnet/efcore#35100
• Array.Contains no longer works in latest .NET 9 SDK (9.0.200) npgsql/efcore.pg#3461
• Preview version of C# language uses incorrect constructor overloading for arrays linkdotnet/StringBuilder#210

[iJungleboy]

Found more cases of this in the app-delete routines...

[iJungleboy]

Added more such workaaround code...