Export/Import content

I created  new page with new blocks.

I'm trying to export new page from one Episerver 9 CMS website, and import it to another Episerver 9 CMS website.

Exporting data is ok, but when trying to import, I get the following error mensage:

Import has been canceled
The following errors have occurred:
[Importing content 4954] Exception: The provided content link does not have a value. Parameter name: contentLink

What does it mean? 

Regards