UI_ImageViewer.uasset' failed to load '/Script/ImgMedia': Can't find file. after editor restart

Development Cinematics & Media
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1

Hi,

I have a widget, where I show image files from an ImgMediaSource. Works well.

Then I have a custom, second widget (named UI_ImageViewer), where I show the same ImgMediaSource. This is shown in a second window and works well until I restart the Unreal Editor. Then the ImgMediaSource variables of UI_ImageViewer are reset to Type “Object”. This happens every time I restart.

ErrorLog:

Content/UI/UI_ImageViewer.uasset' failed to load '/Script/ImgMedia': Can't find file.

The UI_ImageViewer is a BP child of a widget (u_widget). The u_widget is a member of a custom c++ UObject and is shown in a separate SWindow. I think there is the cause of the problem. Initialization? I saw solutions which use a Custom HUD to create a second window. Is this mandatory?

Here is my code to create the second window and the root widget:

header:

UCLASS(Blueprintable)
class MY_APP_API USecondScreenHandler : public UObject
{
    GENERATED_UCLASS_BODY()
public:


    UFUNCTION(BlueprintCallable, Category = "SecondScreenHandler")
    bool createWindowAndWidget(int offset_x, int offset_y, int width, int height, bool topmost);

    UFUNCTION(BlueprintCallable,Category="SecondScreenHandler")
    void destroy();

    UFUNCTION(BlueprintCallable,Category="SecondScreenHandler")
    void bringWindowToFront();


public:
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "SecondScreenHandler")
    TSubclassOf<class UUserWidget> u_widget_subclass;

    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "SecondScreenHandler")
    UUserWidget* u_widget;


private:

    TSharedPtr<class SWidget> s_widget_ptr = nullptr;

    TSharedPtr<class SWindow> s_window_ptr = nullptr;
};

source:

USecondScreenHandler::USecondScreenHandler(const FObjectInitializer& ObjectInitializer) : Super(ObjectInitializer)
{
    static ConstructorHelpers::FClassFinder<UUserWidget> class_finder(TEXT("WidgetBlueprint'/Game/UI/UI_2_Main'"));

    if (class_finder.Succeeded())
    {
        init = true;
        u_widget_subclass = class_finder.Class;
    }
    else
    {
        u_widget_subclass = nullptr;
    }
}

void USecondScreenHandler::destroy()
{
    u_widget->Destruct();

    s_widget_ptr.Reset();
    
    
    if (s_window_ptr.Get() != nullptr)
    {
        s_window_ptr->RequestDestroyWindow();
    }
    s_window_ptr.Reset();
}

void USecondScreenHandler::bringWindowToFront()
{
    s_window_ptr->BringToFront(true);
}

bool USecondScreenHandler::createWindowAndWidget(int offset_x, int offset_y, int width, int height,bool topmost)
{
    if (u_widget_subclass == nullptr)
    {
        return false;
    }

    if (s_window_ptr.IsValid())
    {
        s_window_ptr->RequestDestroyWindow();
        s_window_ptr.Reset();
    }


    s_window_ptr = SNew(SWindow)
            .IsTopmostWindow(topmost)
            .AdjustInitialSizeAndPositionForDPIScale(false)
            .AutoCenter(EAutoCenter::None)
            .Title(FText::FromString(TEXT("OEBB Weststrecke Info")))
            .ClientSize(FVector2D(width, height))
            .ScreenPosition(FVector2D(offset_x, offset_y))
            .CreateTitleBar(false)
            .SizingRule(ESizingRule::FixedSize)
            .IsInitiallyMaximized(true)
            .SupportsMaximize(false)
            .SupportsMinimize(false)
            .HasCloseButton(false);


    FSlateApplication::Get().AddWindow(s_window_ptr.ToSharedRef());


    // create the widget object and add it to the window
    u_widget = CreateWidget<UUserWidget>(GetWorld()->GetFirstPlayerController(), u_widget_subclass);


    s_widget_ptr = u_widget->TakeWidget();
    s_window_ptr->SetContent(s_widget_ptr.ToSharedRef());

    return true;
}

Maybe someone can point me to the problem. Thanks very much in advance.