Python 3.5.1无法下载Robot Framework库

我是Python的新手，正在尝试使用Robot Framework自动化测试。当我尝试通过下载库时pip遇到了一些问题。我使用Python 3.5.1，Robot Framework 3.0，PyCharm 2016.1(64)，

命令的输出pip install robotframework-selenium2library：
Collecting robotframework-selenium2library Using cached robotframework-selenium2library-1.7.4.tar.gz Complete output from command python setup.py egg_info: Downloading http://pypi.python.org/packages/source/d/distribute/distribute-0.6.14.tar.gz Extracting in C:\Users\Radek\AppData\Local\Temp\tmpooendh2g Traceback (most recent call last): File "c:\users\radek\appdata\local\programs\python\python35\lib\site-packages\ez_setup.py", line 143, in use_setuptools raise ImportError ImportError 在处理以上异常期间，发生了另一个异常：

Traceback (most recent call last): File " ", line 1, in File "C:\Users\Radek\AppData\Local\Temp\pip-build-gh4jw21a\robotframework-selenium2library\setup.py", line 8, in use_setuptools() File "c:\users\radek\appdata\local\programs\python\python35\lib\site-packages\ez_setup.py", line 145, in use_setuptools return _do_download(version, download_base, to_dir, download_delay) File "c:\users\radek\appdata\local\programs\python\python35\lib\site-packages\ez_setup.py", line 125, in _do_download _build_egg(egg, tarball, to_dir) File "c:\users\radek\appdata\local\programs\python\python35\lib\site-packages\ez_setup.py", line 99, in _build_egg _extractall(tar) File "c:\users\radek\appdata\local\programs\python\python35\lib\site-packages\ez_setup.py", line 467, in _extractall self.chown(tarinfo, dirpath) TypeError: chown() missing 1 required positional argument: 'numeric_owner'

命令“ python setup.py egg_info”在C：\ Users \ Radek \ AppData \ Local \ Temp \ pip-build-gh4jw21a \ robotframework-selenium2library \中失败，错误代码为1

Setuptools是最新的，ez_setup也是如此

C:\Users\Radek>pip install --upgrade setuptools Requirement already up-to-date: setuptools in c:\users\radek\appdata\local\programs\python\python35\lib\site-packages C:\Users\Radek>pip install ez_setup Requirement already satisfied (use --upgrade to upgrade): ez-setup in c:\users\radek\appdata\local\programs\python\python35\lib\site-packages