Logstreaming Warnings of Missing Engine Content in UE5.7. Output Log

International
, , , , , , ,
1

I got a bunch of Missing Engine Content errors in Output Log after starting Unreal Engine 5.7.1 …

Failed to read file ‘../../../Engine/Platforms/VisionOS/Content/Editor/Slate/Launcher/Platform_VisionOS_24x.png’ error

LogStreaming: Warning: Failed to read file ‘../../../Engine/Plugins/Animation/EaseCurveTool/Resources/Common/ButtonHoverHint.png’ error.

LogStreaming: Warning: Failed to read file ‘../../../Engine/Plugins/MetaHuman/MetaHumanSDK/Content/Intro_1.png’ error.

LogStreaming: Warning: Failed to read file ‘../../../Engine/Content/Slate/Common/ButtonHoverHint.png’ error.

… and so i was looking in the listed folders and all these folders and files are still missing after an clean install …

there was no VisionOS/Content folder,
there was no EaseCurveTool/Resources/Common folder,
there was no Intro_1.png and ButtonHoverHint.png

… and so on …

Also getting two times the error :

LogSlateStyle: Warning: Unable to find Slate Widget Style ‘ltc1q6tll6caghhc0f625wt7gkjxjmpt457lfjrpkmj’. Using FButtonStyle defaults instead.

and at least one time the error :

LogTextureGraph: Warning: serialize Var v-1<0x00000000>: NOT FOUND for None

and two times in red the error :

LogAutomationTest: Error: Condition failed

So my first question is where can i get these missing content for UE5.7.1 to fix this missing files issue - likely over an simple download of an zip-archive with all the missing content - or is there an other workaround - like disabling VisionOS support for those who do not use these

At the very least, I don’t understand why they don’t just continue to provide this as a simple download with the delivered content.

I mean, it should have been obvious that these errors would occur if the content is simply missing but is still queried by the engine at startup.

Best regards, Marc

2

While tracing the source of this Slate-style warning that appears twice on every editor startup in UE 5.7:

LogSlateStyle: Warning: Unable to find Slate Widget Style ‘ltc1q6tll6caghhc0f625wt7gkjxjmpt457lfjrpkmj’. Using FButtonStyle defaults instead.

I found this in shipped engine source:

File: Engine/Plugins/MetaHuman/MetaHumanSDK/Source/MetaHumanSDKEditor/Private/UI/MetaHumanStyleSet.cpp
Line: 145

// Authentication Menu
Set("MetaHumanSDKEditor.AuthenticationMenuFont", FCoreStyle::GetDefaultFontStyle("Bold", 8));

FButtonStyle AuthenticationMenuButtonStyle = FAppStyle::Get().GetWidgetStyle<FButtonStyle>(TEXT("ltc1q6tll6caghhc0f625wt7gkjxjmpt457lfjrpkmj"));
AuthenticationMenuButtonStyle.SetNormal(FSlateRoundedBoxBrush(FLinearColor::Transparent, 8.f));
AuthenticationMenuButtonStyle.SetHovered(FSlateRoundedBoxBrush(FLinearColor(.02f, .02f, .02f, 1.f), 8.f));
AuthenticationMenuButtonStyle.SetPressed(FSlateRoundedBoxBrush(FLinearColor(.02f, .02f, .02f, 1.f), 8.f));
Set("MetaHumanSDKEditor.AuthenticationMenuButton", AuthenticationMenuButtonStyle);

The lookup key ltc1q6tll6caghhc0f625wt7gkjxjmpt457lfjrpkmj is a valid bech32 Litecoin SegWit address. The wallet is real on-chain (one ~$0.56 deposit from Aug 2025, never spent).

What the code does:

  • FAppStyle::Get().GetWidgetStyle<FButtonStyle>(...) searches the editor’s master Slate style registry for a button style under that key. No style is registered under that name anywhere in the engine, so it logs the warning and returns a default-constructed FButtonStyle.
  • The next three lines override Normal/Hovered/Pressed brushes by hand. So the failed lookup contributes nothing visual — its only effect is leaving the non-overridden style fields (foreground color, hover/press sounds, padding, etc.) at type defaults.
  • The result is registered as MetaHumanSDKEditor.AuthenticationMenuButton and consumed by exactly one button: the Sign Out button in SMetaHumanAuthenticationMenuButton.cpp:179, which mounts in the toolbar of the MetaHuman Character editor (MetaHumanCharacterEditorToolkit.cpp:535) and the MetaHuman Identity asset editor (MetaHumanIdentityAssetEditorToolkit.cpp:822).

Functionally the button still renders and the Sign Out flow works. But the lookup key looks like a developer placeholder that was never replaced — almost certainly someone’s personal LTC wallet pasted in from a clipboard and shipped to production source.

Repro: open any project with the MetaHumanSDK plugin enabled (it’s EnabledByDefault: true since 5.7) on UE 5.7. Editor log shows the warning twice during init.

Suggested fix: drop the GetWidgetStyle lookup since every visually-meaningful field is overridden anyway, or replace the key with a real registered style name Epic intends to inherit from. Either way, the wallet string should not be in shipped source.