Error saving credentials: error storing credentials - err: exit status 1, out: `error getting credentials - err: exit status 1

Question 1

I have Ubuntu 20.04 and I have tried using docker login to log in in terminal, but got:

docker login 
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: sfelshtyn
Password: 
Error saving credentials: error storing credentials - err: exit status 1, out: `error getting credentials - err: exit status 1, out:` no usernames for https://index.docker.io/v1/``

Question 2

Try to execute following command

service docker stop
rm ~/.docker/config.json
service docker start

then try docker login it will ask for username and password

Error saving credentials: error storing credentials - err: exit status 1, out: `error getting credentials - err: exit status 1

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