Problems with Elementor page builder

I've installed a new theme on, which makes use of the Elementor page builder.
When I try and edit pages through the builder, I get this error message:
“Sorry the content area was not found in your page”.
"You must call the 'the_content' function in the current template, in order for Elementor to work on this page."
Any ideas what's going wrong here?
thanks! Neil.