Hi,
I have the exact same error using UE4.15.1 and Wwise integration 2016.2.2.6022.371 but my blueprint doesn't have an actor child with an AKComponent.
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:518][ 0]LogWindows:Error: begin: stack for UAT
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:518][ 0]LogWindows:Error: === Critical error: ===
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:518][ 0]LogWindows:Error:
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:518][ 0]LogWindows:Error: Assertion failed: !IsUnreachable() [File:E:\UnreaEngine-Sources\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp] [Line: 1144]
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:518][ 0]LogWindows:Error: AkComponent /Game/Levels/Nano/CityNPCRoom/NPCRoom2.NPCRoom2:PersistentLevel.SequenceShadowCharacter_192.Ak Function: '/Script/AkAudio.AkComponent:UpdateGameObjectPosition'
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:519][ 0]LogWindows:Error:
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:519][ 0]LogWindows:Error:
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:519][ 0]LogWindows:Error: KERNELBASE.dll!RaiseException()
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:519][ 0]LogWindows:Error: UE4Editor-Core.dll!FOutputDeviceWindowsError::Serialize() [e:\unreaengine-sources\engine\source\runtime\core\private\windows\windowsplatformoutputdevices.cpp:120]
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:519][ 0]LogWindows:Error: UE4Editor-Core.dll!FOutputDevice::Logf__VA() [e:\unreaengine-sources\engine\source\runtime\core\private\misc\outputdevice.cpp:70]
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:519][ 0]LogWindows:Error: UE4Editor-Core.dll!FDebug::AssertFailed() [e:\unreaengine-sources\engine\source\runtime\core\private\misc\assertionmacros.cpp:349]
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:520][ 0]LogWindows:Error: UE4Editor-CoreUObject.dll!UObject::ProcessEvent() [e:\unreaengine-sources\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:1144]
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:520][ 0]LogWindows:Error: UE4Editor-AkAudio.dll!UAkComponent::UpdateGameObjectPosition()
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:520][ 0]LogWindows:Error: UE4Editor-Engine.dll!USceneComponent::PropagateTransformUpdate() [e:\unreaengine-sources\engine\source\runtime\engine\private\components\scenecomponent.cpp:648]
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:520][ 0]LogWindows:Error: UE4Editor-Engine.dll!USceneComponent::UpdateComponentToWorldWithParent() [e:\unreaengine-sources\engine\source\runtime\engine\private\components\scenecomponent.cpp:553]
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:520][ 0]LogWindows:Error: UE4Editor-Engine.dll!USceneComponent::UpdateComponentToWorld() [e:\unreaengine-sources\engine\source\runtime\engine\classes\components\scenecomponent.h:787]
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:521][ 0]LogWindows:Error: UE4Editor-Engine.dll!USceneComponent::UpdateChildTransforms() [e:\unreaengine-sources\engine\source\runtime\engine\private\components\scenecomponent.cpp:2145]
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:521][ 0]LogWindows:Error: UE4Editor-Engine.dll!USceneComponent::PropagateTransformUpdate() [e:\unreaengine-sources\engine\source\runtime\engine\private\components\scenecomponent.cpp:667]
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:521][ 0]LogWindows:Error: UE4Editor-Engine.dll!USceneComponent::UpdateComponentToWorldWithParent() [e:\unreaengine-sources\engine\source\runtime\engine\private\components\scenecomponent.cpp:553]
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:521][ 0]LogWindows:Error: UE4Editor-Engine.dll!USceneComponent::UpdateComponentToWorld() [e:\unreaengine-sources\engine\source\runtime\engine\classes\components\scenecomponent.h:787]
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:521][ 0]LogWindows:Error: UE4Editor-Engine.dll!USceneComponent::UpdateChildTransforms() [e:\unreaengine-sources\engine\source\runtime\engine\private\components\scenecomponent.cpp:2145]
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:521][ 0]LogWindows:Error: UE4Editor-Engine.dll!USceneComponent::PropagateTransformUpdate() [e:\unreaengine-sources\engine\source\runtime\engine\private\components\scenecomponent.cpp:667]
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:522][ 0]LogWindows:Error: UE4Editor-Engine.dll!USceneComponent::UpdateComponentToWorldWithParent() [e:\unreaengine-sources\engine\source\runtime\engine\private\components\scenecomponent.cpp:553]
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:522][ 0]LogWindows:Error: UE4Editor-Engine.dll!USceneComponent::UpdateComponentToWorld() [e:\unreaengine-sources\engine\source\runtime\engine\classes\components\scenecomponent.h:787]
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:522][ 0]LogWindows:Error: UE4Editor-Engine.dll!USceneComponent::DetachFromComponent() [e:\unreaengine-sources\engine\source\runtime\engine\private\components\scenecomponent.cpp:2014]
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:522][ 0]LogWindows:Error: UE4Editor-Engine.dll!USceneComponent::AttachToComponent() [e:\unreaengine-sources\engine\source\runtime\engine\private\components\scenecomponent.cpp:1726]
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:525][ 0]LogWindows:Error: ntdll.dll!RtlUserThreadStart()
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:525][ 0]LogWindows:Error: ntdll.dll!RtlUserThreadStart()
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:526][ 0]LogWindows:Error:
[10:28:32][Step 4/4] UE4Editor-Cmd: [2017.04.12-14.28.32:526][ 0]LogWindows:Error: end: stack for UAT