Status of 403

Hello everybody,
I have a problem that I cannot solve on my own. If I try to update an already created popup or if I try to create a new one I get this blocking error message:

Failed to load resource: the server responded with a status of 403 ()
/wp-json/hollerbox/popup/10244

So I can’t in any case use Holler for creating popups. I have tried to find out about this error but I have not found any help so I hope you can help me understand what may be causing this problem.

If I try to make the call directly in the browser I have this result:

{"code":"rest_forbidden","message":"Non hai i permessi per farlo.","data":{"status":401}}

A rather peculiar thing is that I have installed the same copy of the site in localhost and I do not detect any errors there.

I hope someone has a brilliant idea.

Holler Box Version: 2.0.14

Thanks a lot to everyone