"Need placeholders to add children" Error

Arvind Arvind Pro <[email protected]> Mon, 22 Jul 2019 07:49:22 +0530

Newsgroups	gmane.comp.gnome.gtkmm
Message-ID	<[email protected]>

Hi

I am trying to add a Webkit widget to an area within a box widget.
I am getting this error-
"Widgets of type Box need placeholders to add children"

How do I rectify the above error?

Thanks and sincerely,
Arvind.

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