Harris C. just confirming that you have a WEBFLOW paid workspace plan? Some Webflow free plans limit to 2 pages and will throw this error. We're working on making this error more clear now that we have the proper API endpoint to do so.
Saint L. if you've duplicated our style guide, the style guide has a page. So you'd only be able to import 1 page because that style guide is also a page, taking the 2 slot page limit.