GP + Elementor Pro + CPT = Error

Hi,

I'm having an issue using custom post types and Elementor Pro with Generate Press. I've created a custom post type for landing pages and need to be able to edit those posts with Elementor. When I try and open Elementor I get the following error:

"Sorry, the content area was not found in your page. You must call 'the_content' function in the current template, in order for Elementor to work on this page."

If I switch the theme to a standard WordPress theme then the error goes away and I can edit the page with Elementor. Any ideas how I can fix this issue with custom post types and Generate Press? I don't have the option of changing the theme as it's a live client site.