PyRosetta4 installation problem

Hi:

I am trying to install Pyrosetta4 with the following system and software settings:

Ubuntu Linux 16.04 LTS 64Bit

Python 2.7.12 (ubuntu default), 64bit

PyRosetta4.Release.python27.ubuntu.release-184

I followed the instructions given on RyRosetta website and typed in the command "cd setup && sudo python setup.py install" in terminal.

An error message quicked showed up as:

Downloading https://pypi.io/packages/source/s/setuptools/setuptools-3.3.zip
Extracting in /tmp/tmp7GOXbq
Now working in /tmp/tmp7GOXbq/setuptools-3.3
Building a Setuptools egg in /home/zuodong/Program/PyRosetta4/PyRosetta4.Release.python27.ubuntu.release-184/setup
/home/zuodong/Program/PyRosetta4/PyRosetta4.Release.python27.ubuntu.release-184/setup/setuptools-3.3-py2.7.egg
Traceback (most recent call last):
  File "setup.py", line 77, in <module>
    setup_package()
  File "setup.py", line 61, in setup_package
    version = get_package_version(),
  File "setup.py", line 36, in get_package_version
    subprocess.check_output(["git", "rev-parse", "--show-toplevel"]).strip().decode(),
  File "/usr/lib/python2.7/subprocess.py", line 567, in check_output
    process = Popen(stdout=PIPE, *popenargs, **kwargs)
  File "/usr/lib/python2.7/subprocess.py", line 711, in __init__
    errread, errwrite)
  File "/usr/lib/python2.7/subprocess.py", line 1343, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory

Could anyone give me some suggestions on how to fix the problem? Thank you very much!

zsun12