ui::window not working properly

[UltraBlackLinux]

Hey there, I want to create a window with a frame and I wanted to achieve this with ui::window, but whenever I try to create it, nomatter how I do it, I always end up with /src/gtk/window.cpp(2787): assert ""parent"" failed in PreCreation(): Must have non-NULL parent or libs/ui/src/window.cpp(54): assert ""impl"" failed in title(): Widget should be created when using title(). Here is an example:

class Window : public ui::window {
public:
    Window() : ui::window() {
    ui::vbox layout(*this);
    }
}

Why is it not working? Thanks!

[kosenko]

boost::ui::window is an abstract class that can't be created, please use frame or dialog classes and specify title.