Missing reference Exceptions when opening build solution

Hey guys,

I am playing around with integrating Cortana into a universal windows 10 application but I am running into a problem. When I build the Unity project a solution and project is generated at the build location, but when I open that project I get a ton of reference errors:

Code (CSharp):

1. Error CS4036 'IAsyncOperation<StorageFile>' does not contain a definition for 'GetAwaiter' and no extension method 'GetAwaiter' accepting a first argument of type 'IAsyncOperation<StorageFile>' could be found (are you missing a using directive for 'System'?) MirrorVoice

this is obviously because System is not referenced. Should I reference that manually, or is that something that should be resolved another way? If I reference them it would be default the the normal .Net references and not Mono, so I am not sure what to do atm.

 

Here is the output contents:

Code (CSharp):

1. Restoring NuGet packages...
2. To prevent NuGet from restoring packages during build, open the Visual Studio Options dialog, click on the Package Manager node and uncheck 'Allow NuGet to download missing packages during build.'
3. 1>------ Rebuild All started: Project: MirrorVoice, Configuration: Debug x86 ------
4. 1>...\App.xaml.cs(83,21,83,104): error CS4036: 'IAsyncOperation<StorageFile>' does not contain a definition for 'GetAwaiter' and no extension method 'GetAwaiter' accepting a first argument of type 'IAsyncOperation<StorageFile>' could be found (are you missing a using directive for 'System'?)
5. 1>...\App.xaml.cs(85,17,87,87): error CS4036: 'IAsyncAction' does not contain a definition for 'GetAwaiter' and no extension method 'GetAwaiter' accepting a first argument of type 'IAsyncAction' could be found (are you missing a using directive for 'System'?)
6. 1>...\App.xaml.cs(89,20,89,29): error CS0246: The type or namespace name 'Exception' could not be found (are you missing a using directive or an assembly reference?)
7. ========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========
8.  

Now, initially it gave way more errors but a restart reduced that to only the lines I added, which are needed for the voice commands to work. These missing references should be under System though. For reference I am following the instruction from here: http://www.gamasutra.com/blogs/Simo...game_stand_out_with_Cortana_on_Windows_10.php

Also, when I try to build I just get the message that build failed.

 

Yesy, indeed I am. Which brings me back to the question of whether I can savely add it But I just did it and it seems to work. Looks like the app generated is just a framework around Unity that uses the default .Net library, is that correct?

 

I have the same issue while "using System;" is added.
I am using Unity 2018.3.6f1.
Unity "player prefs" are set up for
"Scripting Runtime Version*" = ".NET 4.x Equivalent"
"Api Compatibiliy Level*" = ".NET 4.x"

Code (CSharp):

1. public static class AwaitExtensions
2. {
3.     public static AsyncOperationAwaiter GetAwaiter(this IAsyncOperation asyncOp) => new AsyncOperationAwaiter(asyncOp);
4. }
5.  

What do I wrong?