Docker Push Error : FATA[0001] Respository does not exist

Docker Push Error : FATA[0001] Respository does not exist

docker push ${login_name}/${image_name} fails

docker push docker.io/${login_name}/${image_name} fails

docker tag ${image_id} docker.io/${login_name}/${image_name} and then docker push docker.io/${login_name}/${image_name} is OK