What is System.Private.CoreLib.dll and why is it giving me an error on UWP?

Background:

Building for UWP, the app uses the REST client for Azure at https://github.com/Unity3dAzure/RESTClient.
I am not sure if the REST client is to blame though because I can't figure out how to debug this.

Problem:
When I run the build from visual studio I get an error message in the Development Console saying:

Error could not find assembly System.Private.CoreLib.dll in which type System.Action'1[RESTClient.IRestResponse'1[LineOfBattleWebBackend.Application.Dtos.ScoreDtoOutput[]]] resides

The class ScoreDtoOutput is just a basic serialized class with no strange namespaces or anything.

Questions:
The interface IRestResponse has a reference to System.Net which I was thinking maybe was not available on Core? I tried to look it up and it looks like it is available on Nuget for core, do I need to add it manually or something?

Also, what the heck is System.Private.CoreLib.dll?

 

I don't get an actual exception that I can see in VS2017, only the error in the Development Console. I tried turning off "my code only" but still do not get an exception.

Actually, I can't find anything that goes wrong either, everything seems to work, except for the print to the concole, but I don't want this coming back to haunt me later

 

Umm I don't see a stack trace, I am talking about the console in the built unity app here. Or do you mean from a log file somewhere?

 

The entire contents of the window are:

Error could not find assembly System.Private.CoreLib.dll in which type System.Action'1[RESTClient.IRestResponse'1[LineOfBattleWebBackend.Application.Dtos.ScoreDtoOutput[]]] resides

No extra info comes up if I try to expand the message

 

Ok, thanks, I'll have a look! I need to learn more about debugging for UWP, obviously...

 

This is the output in VS:
Warning: unknown type VikingCrewDevelopment.OnlineHighscores.RestApiService+<Get_Coroutine>d__19`1[LineOfBattleWebBackend.Application.Dtos.ScoreDtoOutput[]] detected. Using reflection to gather its type information. Consider to reference it from your scripts so it can gathered during the build process.

(Filename: C:\buildslave\unity\build\Runtime/ScriptingBackend/DotNet/ScriptingTypeProvider_DotNet.cpp Line: 154)

I don't really understand that error though. The classes are referenced in code allright. And they are not in another DLL, they are in the Plugins folder so should be in firstpass-dll or whatever it is called.

 

I'm on 2017.3, if you want me to test on another version, let me know.

This is how the class i used:

Code (csharp):

1.  
2. public IEnumerator GetNearbyScores(int numScores, int score, Action<ScoreDtoOutput[]> callback = null, Action<string> errorCallback = null)
3.         {
4.             Action<IRestResponse<ScoreDtoOutput[]>> restCallback = (response) =>
5.             {
6.                 if (response.IsError && errorCallback != null)
7.                     errorCallback(response.ErrorMessage);
8.                 if (!response.IsError && callback != null)
9.                     callback(response.Data);
10.             };
11.             yield return Get_Coroutine<ScoreDtoOutput[]>(_apiUrl + "scores/nearby/" + numScores  + "/" + score, restCallback);
12.         }
13.  

This is the class:

Code (csharp):

1.  
2. using System;
3.  
4. namespace LineOfBattleWebBackend.Application.Dtos
5. {
6.     [Serializable]
7.     public class ScoreDtoInput
8.     {
9.      
10.         public int Waves;
11.         public int Rank;
12.         public string UserName = "Unknown Soldier";
13.         public int Platform;
14.         public string Transmogrification;
15.  
16.         public ScoreDtoInput() { }
17.  
18.         public override string ToString()
19.         {
20.             return Rank + " " + UserName + " " + Waves + " waves ";
21.         }
22.     }
23.     [Serializable]
24.     public class ScoreDtoOutput : ScoreDtoInput
25.     {
26.         public Guid Id;
27.         public Guid UserId;
28.         public int ListPosition;
29.         public ScoreDtoOutput() { }
30.  
31.         public override string ToString()
32.         {
33.             return base.ToString();
34.         }
35.     }
36. }
37.  
38.  

 

Sorry for the late reply, it took some time before I could test this, but yeah, that removed the error so you're probably right!

I am happy with that solution but let me know if you want me to test something else. Thank you so much for always taking the time to help and explaining a little bit what goes on under the hood This isn't the first time you help me and probably not the last either