Cannot import name locked_file

I'm trying to use gsutil on my machine but I can't, this is the error:

`cannot import name locked_file`

I'm using linux, python 2.7, gsutil 4.20 and oauth2client 4.0

This is the error traceback:

` # gsutil
Traceback (most recent call last):
File "/usr/lib/python-exec/python2.7/gsutil", line 11, in
load_entry_point('gsutil==4.20', 'console_scripts', 'gsutil')()
File "/usr/lib64/python2.7/site-packages/pkg_resources/__init__.py", line
561, in load_entry_point
return get_distribution(dist).load_entry_point(group, name)
File "/usr/lib64/python2.7/site-packages/pkg_resources/__init__.py", line
2627, in load_entry_point
return ep.load()
File "/usr/lib64/python2.7/site-packages/pkg_resources/__init__.py", line
2287, in load
return self.resolve()
File "/usr/lib64/python2.7/site-packages/pkg_resources/__init__.py", line
2293, in resolve
module = __import__(self.module_name, fromlist=['__name__'], level=0)
File "/usr/lib64/python2.7/site-packages/gslib/__main__.py", line 53, in

from gslib import wildcard_iterator
File "/usr/lib64/python2.7/site-packages/gslib/wildcard_iterator.py",
line 37, in
from gslib.third_party.storage_apitools import storage_v1_messages as
apitools_messages
File "/usr/lib64/python2.7/site-
packages/gslib/third_party/storage_apitools/storage_v1_messages.py", line
22, in
from apitools.base.py import encoding
File "/usr/lib64/python2.7/site-packages/apitools/base/py/__init__.py",
line 22, in
from apitools.base.py.credentials_lib import *
File "/usr/lib64/python2.7/site-
packages/apitools/base/py/credentials_lib.py", line 50, in
from oauth2client import locked_file
ImportError: cannot import name locked_file`

And this is the installed packages:

` [I] net-misc/gsutil
Available versions: ~3.42 ~4.19 (~)4.20 {PYTHON_TARGETS="python2_7"}
Installed versions: 4.20`
`[I] dev-python/oauth2client
Available versions: 1.5.2^t 2.0.1^t ~2.2.0^t (~)4.0.0^t {test PYTHON_TARGETS="pypy python2_7 python3_4 python3_5 python3_6"}
Installed versions: 4.0.0^`