I am getting the following error with s3cmd, pulling from the master branch. It was working fine as of 2 days ago.

If instead of pulling from master, I use version 1.6, it works fine.

DEBUG: s3cmd version 2.0.0+
DEBUG: ConfigParser: Reading file '/home/ubuntu/.s3cfg'

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
An unexpected error has occurred.
Please try reproducing the error using
the latest s3cmd code from the git master
branch found at:
https://github.com/s3tools/s3cmd
and have a look at the known issues list:
https://github.com/s3tools/s3cmd/wiki/Common-known-issues-and-their-solutions
If the error persists, please report the
following lines (removing any private
info as necessary) to:
s3tools-bugs@lists.sourceforge.net

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

DEBUG: Unicodising './s3cmd' using UTF-8
DEBUG: Unicodising '--debug' using UTF-8
DEBUG: Unicodising 'get' using UTF-8
DEBUG: Unicodising '--recursive' using UTF-8
DEBUG: Unicodising 's3://a/b/' using UTF-8
DEBUG: Unicodising '/c/d/' using UTF-8
Invoked as: ./s3cmd --debug get --recursive s3://a/b/ /c/d/
Problem: NameError: global name 'json' is not defined
S3cmd: 2.0.0+
python: 2.7.6 (default, Oct 26 2016, 20:30:19)
[GCC 4.8.4]
environment LANG=en_US.UTF-8

Traceback (most recent call last):
File "./s3cmd", line 3003, in
rc = main()
File "./s3cmd", line 2726, in main
cfg = Config(options.config, options.access_key, options.secret_key, options.access_token)
File "/root/s3cmd/S3/Config.py", line 179, in init
self.role_config()
File "/root/s3cmd/S3/Config.py", line 200, in role_config
creds=json.load(resp)
NameError: global name 'json' is not defined

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
An unexpected error has occurred.
Please try reproducing the error using
the latest s3cmd code from the git master
branch found at:
https://github.com/s3tools/s3cmd
and have a look at the known issues list:
https://github.com/s3tools/s3cmd/wiki/Common-known-issues-and-their-solutions
If the error persists, please report the
above lines (removing any private
info as necessary) to:
s3tools-bugs@lists.sourceforge.net
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!