title: Command errored out with exit status one
body: <p>I am installing qark in my pc(Windows 7) for testing purpose. I have installed python 3.7.2 and pip 19.2.3. For next step, I have to install the requirement.txt file while installing, an error occurred(Command errored out with exit status 1:) full error I will give below.</p>
  
  <p>I tried installing it again but error was same I don't know what should I do. Help me.
  Thank you</p>
  
  <pre><code>    ERROR: Command errored out with exit status 1:
       command: 'c:\users\hp\appdata\local\programs\python\python37\python.exe' -c
   'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\HP\\AppData\\L
  ocal\\Temp\\pip-install-6tjj0pbq\\cffi\\setup.py'"'"'; __file__='"'"'C:\\Users\\
  HP\\AppData\\Local\\Temp\\pip-install-6tjj0pbq\\cffi\\setup.py'"'"';f=getattr(to
  kenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"
  '"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --
  egg-base pip-egg-info
           cwd: C:\Users\HP\AppData\Local\Temp\pip-install-6tjj0pbq\cffi\
      Complete output (27 lines):
      Traceback (most recent call last):
        File "&lt;string&gt;", line 1, in &lt;module&gt;
        File "C:\Users\HP\AppData\Local\Temp\pip-install-6tjj0pbq\cffi\setup.py",
  line 120, in &lt;module&gt;
          if sys.platform == 'win32' and uses_msvc():
        File "C:\Users\HP\AppData\Local\Temp\pip-install-6tjj0pbq\cffi\setup.py",
  line 98, in uses_msvc
          return config.try_compile('#ifndef _MSC_VER\n#error "not MSVC"\n#endif')
  
        File "c:\users\hp\appdata\local\programs\python\python37\lib\distutils\com
  mand\config.py", line 227, in try_compile
          self._compile(body, headers, include_dirs, lang)
        File "c:\users\hp\appdata\local\programs\python\python37\lib\distutils\com
  mand\config.py", line 133, in _compile
          self.compiler.compile([src], include_dirs=include_dirs)
        File "c:\users\hp\appdata\local\programs\python\python37\lib\distutils\_ms
  vccompiler.py", line 345, in compile
          self.initialize()
        File "c:\users\hp\appdata\local\programs\python\python37\lib\distutils\_ms
  vccompiler.py", line 238, in initialize
          vc_env = _get_vc_env(plat_spec)
        File "c:\users\hp\appdata\local\programs\python\python37\lib\site-packages
  \setuptools\msvc.py", line 185, in msvc14_get_vc_env
          return EnvironmentInfo(plat_spec, vc_min_ver=14.0).return_env()
        File "c:\users\hp\appdata\local\programs\python\python37\lib\site-packages
  \setuptools\msvc.py", line 1228, in return_env
          self.OSIncludes,
        File "c:\users\hp\appdata\local\programs\python\python37\lib\site-packages
  \setuptools\msvc.py", line 963, in OSIncludes
          sdkver = self._sdk_subdir
        File "c:\users\hp\appdata\local\programs\python\python37\lib\site-packages
  \setuptools\msvc.py", line 1057, in _sdk_subdir
          ucrtver = self.si.WindowsSdkLastVersion
        File "c:\users\hp\appdata\local\programs\python\python37\lib\site-packages
  \setuptools\msvc.py", line 604, in WindowsSdkLastVersion
          self.WindowsSdkDir, 'lib'))
        File "c:\users\hp\appdata\local\programs\python\python37\lib\site-packages
  \setuptools\msvc.py", line 809, in _use_last_dir_name
          for dir_name in reversed(os.listdir(path))
      FileNotFoundError: [WinError 3] The system cannot find the path specified: '
  C:\\Program Files (x86)\\Microsoft Visual Studio 14.0\\VC\\PlatformSDK\\lib'
      ----------------------------------------
  ERROR: Command errored out with exit status 1: python setup.py egg_info Check th
  e logs for full command output.
  </code></pre>