I tried to install VEP by docker with the following commands in Ubuntu 18.04 (64-bit)

sudo apt-get update
sudo apt-get remove docker docker-engine docker.io
sudo apt install docker.io
sudo systemctl start docker
sudo systemctl enable docker
docker --version

Docker installation sucessfully. and then I tried several different resources to install VEP:

sudo docker pull ensemblorg/ensembl-vep
sudo docker pull willmclaren/ensembl-vep

However, all the docker will give me the same error:

unauthorized: authentication required

Any suggestion?

Thansk.