Iframe strange error

When I’m trying to use Iframe widget from the Mendix store, I’m getting a strange error. I tried to use Sketchfab and many othert services, which, as I know, allow integrating their content as Iframes, but it still doesn’t work in my app. What can be the reason of this error, and what can I do to fix it in Mendix desktop builder? Thank you in advance!
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