403 “Forbidden” ajax error when saving

Hello, was trying to save translations but this error appears.

Here’s what I see in the console in red:
Failed to load resource: the server responded with a status of 403 (Forbidden)
/wp-admin/admin-ajax.php:1

admin.js?ver=2.3.3:104 Loco Error: Ajax failure for save
c.debug @ admin.js?ver=2.3.3:104

And this written out:
Provide the following text when reporting a problem:
—-
Status 403 “Forbidden” (text/html; charset=iso-8859-1 199 bytes)
403 Forbidden
Forbidden
You don’t have permission to access this resource.
====

In options I have this checked, so that’s not the problem:
Enable Ajax file uploads (Recommended)

What should I do?
Thanks in advance!