Hey Baris,
In my Node.js code with superagent, the privilege should've been groups:posts:downvote rather than group:posts:downvote. I got privileges manipulation to work now!
Please tell me how to return a group of guests? I didn't can find that group and add her again.
I deleted guests groups in 1000 category and now I don't understand what do. Please, give me code example for add to that group all categories.
I found the solution. Thanks!!!