No module named _winreg

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    Traceback (most recent call last):
    File "app.py", line 181, in
    app.run(host='0.0.0.0', debug=True)
    File "/usr/lib/python2.7/dist-packages/flask/app.py", line 772, in run
    run_simple(host, port, self, **options)
    File "/usr/local/lib/python2.7/dist-packages/werkzeug/serving.py", line 622, in run_simple
    reloader_type)
    File "/usr/local/lib/python2.7/dist-packages/werkzeug/_reloader.py", line 269, in run_with_reloader
    reloader.run()
    File "/usr/local/lib/python2.7/dist-packages/werkzeug/_reloader.py", line 159, in run
    for filename in chain(_iter_module_files(), self.extra_files):
    File "/usr/local/lib/python2.7/dist-packages/werkzeug/_reloader.py", line 70, in _iter_module_files
    for package_path in getattr(module, 'path', ()):
    File "/usr/lib/python2.7/dist-packages/six.py", line 116, in getattr
    _module = self._resolve()
    File "/usr/lib/python2.7/dist-packages/six.py", line 105, in _resolve
    return _import_module(self.mod)
    File "/usr/lib/python2.7/dist-packages/six.py", line 76, in _import_module
    import(name)
    ImportError: No module named _winreg