Installtion error in centos 7

i am trying to install erpnext prodution mode in centos but geting this issue again and again i tried all discussion similar topic but didn’t get success.

fatal: [localhost]: FAILED! => {"changed": true, "cmd": ["bench", "init", "/home/frappe/frappe-bench", "--frappe-path", "https://github.com/frappe/frappe", "--frappe-branch", "master"], "delta": "0:00:00.967936", "end": "2018-08-21 10:31:29.041428", "msg": "non-zero return code", "rc": 1, "start": "2018-08-21 10:31:28.073492", "stderr": "Traceback (most recent call last):\n File \"/bin/bench\", line 6, in <module>\n from pkg_resources import load_entry_point\n File \"/usr/lib/python2.7/site-packages/pkg_resources/__init__.py\", line 3105, in <module>\n @_call_aside\n File \"/usr/lib/python2.7/site-packages/pkg_resources/__init__.py\", line 3089, in _call_aside\n f(*args, **kwargs)\n File \"/usr/lib/python2.7/site-packages/pkg_resources/__init__.py\", line 3118, in _initialize_master_working_set\n working_set = WorkingSet._build_master()\n File \"/usr/lib/python2.7/site-packages/pkg_resources/__init__.py\", line 580, in _build_master\n return cls._build_from_requirements(__requires__)\n File \"/usr/lib/python2.7/site-packages/pkg_resources/__init__.py\", line 593, in _build_from_requirements\n dists = ws.resolve(reqs, Environment())\n File \"/usr/lib/python2.7/site-packages/pkg_resources/__init__.py\", line 781, in resolve\n raise DistributionNotFound(req, requirers)\npkg_resources.DistributionNotFound: The 'GitPython==0.3.2.1' distribution was not found and is required by bench", "stderr_lines": ["Traceback (most recent call last):", " File \"/bin/bench\", line 6, in <module>", " from pkg_resources import load_entry_point", " File \"/usr/lib/python2.7/site-packages/pkg_resources/__init__.py\", line 3105, in <module>", " @_call_aside", " File \"/usr/lib/python2.7/site-packages/pkg_resources/__init__.py\", line 3089, in _call_aside", " f(*args, **kwargs)", " File \"/usr/lib/python2.7/site-packages/pkg_resources/__init__.py\", line 3118, in _initialize_master_working_set", " working_set = WorkingSet._build_master()", " File \"/usr/lib/python2.7/site-packages/pkg_resources/__init__.py\", line 580, in _build_master", " return cls._build_from_requirements(__requires__)", " File \"/usr/lib/python2.7/site-packages/pkg_resources/__init__.py\", line 593, in _build_from_requirements", " dists = ws.resolve(reqs, Environment())", " File \"/usr/lib/python2.7/site-packages/pkg_resources/__init__.py\", line 781, in resolve", " raise DistributionNotFound(req, requirers)", "pkg_resources.DistributionNotFound: The 'GitPython==0.3.2.1' distribution was not found and is required by bench"], "stdout": "", "stdout_lines": []}

thank you:)