Hope you have a nice weekend, another support staff here, at first when I check the about page I’m able to open it on Cornerstone without an issue (https://prnt.sc/wygd2e).
But then when I check the homepage I see the error that you’re talking about, and that error is poiting to this file
When I investigated that file its broken (incomplete), but when I add a random parameter
(?nocache) to its URL the file is fine. So that tells me that the broken file is a cache file. Then I did go ahead and check if you have caching plugin and saw WC3 Total cache, I purged its caches and excluded the file from being minified, but no luck the file is still broken. Do you happen to have any other caching feature on the site?
Browser’s cache could possible involve too, please do your edits in incognito/private mode for awhile.
I’ve force clearing the broken cache file by deleting the Cornerstone and reinstalling it. That seems to do the trick and I was able to open your homepage in Cornerstone with no issue (https://prnt.sc/wyiex4).
Hope that helps,