But I could add component inside so I thought it was a
page (because
it is).
Yeah, posts can have other structures (images, components, etc.) as
children again. A post is a page, but it has much more properties like
post-date, editor, ...
So may be you should have a better error message.
I agree that the error message is bad.
Lukas
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Lukas Renggli
http://www.lukas-renggli.ch