Package conflict when upgrading Meta XR All-in-One SDK

[elgun.cumayev]

I had Meta XR All-in-One SDK version 60 and tried to upgrade to 62, Unity crashed once, then I opened in SafeMode and there was this error:
Library\PackageCache\com.meta.xr.sdk.core@62.0.0\Scripts\Util\Async\OVRTask.cs(819,9): error CS0433: The type 'ManualResetValueTaskSourceCore<TResult>' exists in both 'Microsoft.Bcl.AsyncInterfaces, Version=5.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' and 'netstandard, Version=2.1.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
What can I do? It seems both are from System DLLs. 

[andrew.alderete]

I am having the same issue.

[elgun.cumayev · Accepted solution]

We found it ourselves.
1. Find and select Microsoft.Bcl.AsyncInterfaces.dll file in Assets (in our case it is in the "IdentityModel" folder)
2. On inspector uncheck "Any platform" and all platforms ("Editor", "Standalone", "Android")
3. Click Apply.
That solved the problem for us

[andrew.alderete]

Sadly this did not work for me. While it solves the immediate error, building an APK fails with the same issue every time. 

[TheKero]

That does not solve the conflict.

[andrew.alderete]

Yep I can confirm it does not.