WordPress Error: "Response to preflight request..."

Hosting Support
1

Error Message

Hello, I can’t save changes by updating widgets in the Wordpress section: Appereance >> Widgets, because the text: “An error occurred. You are probably offline” appears and in the console log there is this error message:

" Access to fetch at ‘https://errors.infinityfree.net/errors/403/’ (redirected from ‘https://creandoandricreando.great-site.net/wp-json/batch/v1?_locale=user’) has been blocked by CORS policy: Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource. If an opaque response serves your needs, set the request’s mode to ‘no-cors’ to fetch the resource with CORS disabled. "

I’ve tried to disable all plugins and to return to the default theme, but nothing is changed.

2

Unfortunately, the widget update seems to be running into the security system:

An explanation on why this happens is mentioned here:

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