Ckeditor and Ckfinder with file manager

hello to the whole community, I need help with the integration of ckfinder and CI 3.X, I have been shipwrecked on the internet between old posts and some more current ones even within the forums of this community and I still have not been able to find advice to make the ckfinder file manager, I have already managed to do the CRUD with the editor and I can even upload images and display them in the editor and in the controller view, but I can't get the filemanager to work, it always keeps loading and showing the message "please wait. "
In console it marks error 400. Someone has an idea
Thank you very much in advance