Error Reading Form

Fixing inherited vs object in .fmx files

If you use visual inheritance, especially with frames, the IDE may occasionally leave the .fmx file in an incorrect state, changing inherited to object. This can cause the following error:

The inherited keyword tells the component streaming system that the root object derives from an ancestor definition, whereas object describes it as a regular streamed object.

To fix the issue, close the project, open the .fmx file in a text editor, and change object back to inherited.

For example, I encountered this issue with ArticlesView. I changed ArticlesView.fmx from:

object ArticlesView: TArticlesView
    Size.Width = 209.000000000000000000
    Size.Height = 443.000000000000000000
    object Scroller: TVertScrollBox
        Align = Client
        Margins.Top = 8.000000000000000000
        Size.Width = 209.000000000000000000
        Size.Height = 435.000000000000000000
        Size.PlatformDefault = False
        TabOrder = 0
        Viewport.Width = 209.000000000000000000
        Viewport.Height = 435.000000000000000000
    end
end

to:

inherited ArticlesView: TArticlesView
    Size.Width = 209.000000000000000000
    Size.Height = 443.000000000000000000
    object Scroller: TVertScrollBox
        Align = Client
        Margins.Top = 8.000000000000000000
        Size.Width = 209.000000000000000000
        Size.Height = 435.000000000000000000
        Size.PlatformDefault = False
        TabOrder = 0
        Viewport.Width = 209.000000000000000000
        Viewport.Height = 435.000000000000000000
    end
end