UE4.26 crashes when trying to trigger Speak function from a Remote API Call

[dhardjono]

Hi, when combining this sample project with Unreal's Remote Control API , the whole UE4.26 crashes completely.

My function is called ReadMessage, defined solely in the blueprint:

And this is the request:

POST http://127.0.0.1:30010/remote/object/call
{
    "objectPath": "/Game/AmazonPollyMetaHuman/Scene/MetaHumanScene.MetaHumanScene:PersistentLevel.BP_Ada2_2",
    "functionName": "ReadMessage",
    "parameters": {
        "messageToRead": "Hello I'm Ada, how are you doing?"
    }
}

The error message that I got is:

LoginId:<redacted>
EpicAccountId:<redacted>

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x0000000000000000

UE4Editor_AmazonPollyMetaHuman_3538!USpeechComponent::SynthesizeAudio() [D:\Repositories\amazon-polly-metahumans\Source\AmazonPollyMetaHuman\Private\SpeechComponent.cpp:124]
UE4Editor_AmazonPollyMetaHuman_3538!USpeechComponent::GenerateSpeechSync() [D:\Repositories\amazon-polly-metahumans\Source\AmazonPollyMetaHuman\Private\SpeechComponent.cpp:118]
UE4Editor_AmazonPollyMetaHuman_3538!<lambda_71e7cd1c01ca36e3ca6a661652370fe3>::operator()() [D:\Repositories\amazon-polly-metahumans\Source\AmazonPollyMetaHuman\Private\GenerateSpeechAction.cpp:39]
UE4Editor_Core!TGraphTask<FAsyncGraphTask>::ExecuteTask() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Public\Async\TaskGraphInterfaces.h:886]
UE4Editor_Core!FTaskThreadAnyThread::ProcessTasks() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Private\Async\TaskGraph.cpp:1065]
UE4Editor_Core!FTaskThreadAnyThread::ProcessTasksUntilQuit() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Private\Async\TaskGraph.cpp:888]
UE4Editor_Core!FTaskThreadAnyThread::Run() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Private\Async\TaskGraph.cpp:965]
UE4Editor_Core!FRunnableThreadWin::Run() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsRunnableThread.cpp:86]

To clarify, I did manage to successfully make Ada talk if I add UEDPIE_0_ prefix before the Scene name / Object Path inside the POST body, so that it becomes "objectPath": "/Game/AmazonPollyMetaHuman/Scene/UEDPIE_0_MetaHumanScene.MetaHumanScene:PersistentLevel.BP_Ada2_2",.

But the issue is when I try to run it as standalone game, e.g. for Pixel Streaming, the UEDPIE_0_ isn't relevant anymore (since it's not Play In Editor, aka PIE), and when calling the function without the prefix, the whole UE4.26 crashes.

Can someone help me further with this?

Thanks a lot in advance!!

[dhardjono]

Found the problem, it was because Port 30010 was already in use by my Unreal Editor itself, so the Standalone app cannot use it. Therefore it ran into memory error because there was no instance of the speech running in the editor. After closing all apps and starting the standalone project, it works wonderfully.