docker 这样算不算成功了？下面的Error saving credentials:是什么意思？

[weixin_48139740]

docker login docker.io
WARNING: Error loading config file: /home/dell/.docker/config.json: stat /home/dell/.docker/config.json: permission denied
Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one.
Username: kong98
Password:
WARNING! Your password will be stored unencrypted in /home/dell/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store

Error saving credentials: open /home/dell/.docker/config.json992621665: permission denied