錯誤：pkg_resources.DistributionNotFound：在「Django的== 1.9.1」分配未找到

Question

我收到以下錯誤跟蹤時，我試圖運行Python環境服務器：

Traceback (most recent call last): 
    File "/home/web/.virtualenvs/kolibri/bin/kolibri", line 5, in <module> 
    from pkg_resources import load_entry_point 
    File "/home/web/.virtualenvs/kolibri/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2927, in <module> 
    @_call_aside 
    File "/home/web/.virtualenvs/kolibri/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2913, in _call_aside 
    f(*args, **kwargs) 
    File "/home/web/.virtualenvs/kolibri/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2940, in _initialize_master_working_set 
    working_set = WorkingSet._build_master() 
    File "/home/web/.virtualenvs/kolibri/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 637, in _build_master 
    return cls._build_from_requirements(__requires__) 
    File "/home/web/.virtualenvs/kolibri/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 650, in _build_from_requirements 
    dists = ws.resolve(reqs, Environment()) 
    File "/home/web/.virtualenvs/kolibri/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 829, in resolve 
    raise DistributionNotFound(req, requirers) 
pkg_resources.DistributionNotFound: The 'django==1.9.1' distribution was not found and is required by kolibri 

其有關的Django == 1.9.1。任何想法爲什麼發生這種情況？

Answer 1

呀發現了一個ANS，只需運行命令：

sudo pip install -U djangorestframework 

，或者你可以按照如下步驟：

* first check version of django 
* if it is not given as per distrubution package then delete it using following command: 
    $ pip uninstall Django 
* again install specific version of django: 
    $ pip install django==1.9.1 (e.g 1.9.6 or 1.8 or 1.7) 
    $ django-admin --version // 1.9.1