RSS Feed/News Cannot customize forum permissions

[ENXF NET]

Hello, I am currently testing the demo to convince myself to buy and switch to another software and I have to say that I have noticed a bug that makes the whole thing difficult.

when I want to customize things it tells me the following error:

Oops! We ran into some problems.
Oops! We ran into some problems. Please try again later. More error details may be in the browser console.
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The Browser Console says the following:

Failed to load resource: the server responded with a...
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