Error "The call is ambiguous between the following methods or properties" Unity3D

[spiNkerZ]

Hello everyone Faced with such a problem after upgrading to Unity3D 2023.1.0.b18:

error CS0121: The call is ambiguous between the following methods or properties: 'Cysharp.Threading.Tasks.UnityAsyncExtensions.GetAwaiter(UnityEngine.AsyncOperation)' and 'UnityEngine.AsyncOperationAwaitableExtensions.GetAwaiter(UnityEngine.AsyncOperation)'

My code:

await UnityEngine.SceneManagement.SceneManager.LoadSceneAsync(ID);
``
I solved this problem in this way if anyone needs:

 AsyncOperation loadSceneHandler = UnityEngine.SceneManagement.SceneManager.LoadSceneAsync(ID);

 await loadSceneHandler.ToUniTask();

[anonymous2585]

Warning

From the UniTask Readme:

In UniTask, await directly uses native timing, while WithCancellation and ToUniTask use specified timing. This is usually not a particular problem, but with LoadSceneAsync, it causes a different order of Start and continuation after await. So it is recommended not to use LoadSceneAsync.ToUniTask.

At first I used this and it seemed to work fine in editor and standalone windows builds. But when I tested in a UWP build (IL2CPP), the await loadSceneHandler.ToUniTask(); hold the whole app and all I got was a black screen.

[neuecc]

UnityAsyncExtensions.GetAwaiter is disabled in UNITY_2023_1_OR_NEWER.

UniTask/src/UniTask/Assets/Plugins/UniTask/Runtime/UnityAsyncExtensions.cs

Lines 18 to 25 in 0c8057c

	#if !UNITY_2023_1_OR_NEWER
	// from Unity2023.1.0a15, AsyncOperationAwaitableExtensions.GetAwaiter is defined in UnityEngine.
	public static AsyncOperationAwaiter GetAwaiter(this AsyncOperation asyncOperation)
	{
	Error.ThrowArgumentNullException(asyncOperation, nameof(asyncOperation));
	return new AsyncOperationAwaiter(asyncOperation);
	}
	#endif

Why is it enabled?

[anonymous2585]

I don't know...
I'm using Unity 2023.1.16f1 and have the name conflict.
It seems UNITY_2023_1_OR_NEWER is false in my project (so the code is included), this is very strange.

[anonymous2585]

My issue is with Visual Studio.
The define are not properly set, so Visual Studio underline await SceneManager.UnloadSceneAsync("my_scene_name"); in red with error CS0121, but it's ok in Unity.

[neuecc]

How about regenerating csproj?
Delete the sln and csproj and have Unity regenerate them.

[anonymous2585]

Already done, and it doesn't fix preprocessor directives in Visual Studio.
I think it's because of some incompatibility of my Visual Studio version and the Unity Visual Studio package version, but I can't change easily them becuse my company computer doesn't have an access to the internet.
It's not a big issue for me, now I understood it's broken only in Visual Studio.

[albermotion]

I know I'm late to the conversation but in case it happens to someone else:
You need to set using UnityEngine; in the class you are setting your await or else it will try to get the AsyncOperation from LoadSceneAsync instead of the Awaitable version from Unity