Get "WARNING: Error loading config file:illegal base64 data at input byte 6" with new installed docker 1.8.1

I just installed docker 1.8.1 on a fresh ubuntu 14.04 (ami-d05e75b8), and gets this warning message: WARNING: Error loading config file:illegal base64 data at input byte 6 every time I run docker ps or docker images. I followed the steps here: Install Docker Engine on Ubuntu | Docker Docs. Not sure what’s going on. the followings are the copy from command line:

ubuntu@ip-xx-xx-xx-xx:~$ docker ps
WARNING: Error loading config file:illegal base64 data at input byte 6
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
ubuntu@ip-xx-xx-xx-xx:~$ docker version
WARNING: Error loading config file:illegal base64 data at input byte 6
Client:
Version: 1.8.1
API version: 1.20
Go version: go1.4.2
Git commit: d12ea79
Built: Thu Aug 13 02:35:49 UTC 2015
OS/Arch: linux/amd64

Server:
Version: 1.8.1
API version: 1.20
Go version: go1.4.2
Git commit: d12ea79
Built: Thu Aug 13 02:35:49 UTC 2015
OS/Arch: linux/amd64

same result when running with root. Any help are appreciated.

I found the reason, the email is wrong in .dockercfg. Sorry for the noise.