using azure spatial anchors makes project crashed in unreal engine4 with hololens2

Question

using device is hololens2 and doing in unreal engine 4

when playing, project is always crashed after creating azure spatial anchors code according to this tutorial below.

https://learn.microsoft.com/en-us/windows/mixed-reality/develop/unreal/unreal-azure-spatial-anchors

Assertion failed: Impls.Num() <= 1 [File:D:\Build++UE4\Sync\Engine\Plugins\Runtime\AR\AzureSpatialAnchors\Source\AzureSpatialAnchors\Public\IAzureSpatialAnchors.h] [Line: 61]

UE4Editor_Core
UE4Editor_Core
UE4Editor_AzureSpatialAnchors
UE4Editor_AzureSpatialAnchors
UE4Editor_AzureSpatialAnchors
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor
UE4Editor
UE4Editor
UE4Editor
UE4Editor
UE4Editor
kernel32
ntdll

after uncheking Azure Spatial Anchor for WMR plugins, Crashing disapears..
But according to the tutorial, I may have to enable that plugins again for deploying app on hololens
How can i handle with this?

Answer 1

When using ASA for Unreal, there is an Azure Spatial Anchors plugin, which contains the common interface for all supported platforms (WMR, ARKit, ARCore, OpenXR), then each supported platform has its own plugin.

The way ASA is written in the engine, it only supports having a single active implementation:
https://github.com/EpicGames/UnrealEngine/blob/1e5926084bbf386041103735ed6c2ab27bc1c1ee/Engine/Plugins/Runtime/AR/AzureSpatialAnchors/Source/AzureSpatialAnchors/Public/IAzureSpatialAnchors.h#L61

// There can be only one! Or zero. The implementations are platform specific and we are not currently supporting 'overlapping' platforms.
check(Impls.Num() <= 1);

This error means that you have more than one enabled. Try unchecking any ASA plugins you are not currently building for.