AttributeError

I installed from the git source but when I am trying to run the I am
getting this
error.I am using Ubuntu 17.10.What do I do?

AttributeError

AttributeError: 'Babel' object has no attribute 'load_locale'
Traceback *(most recent call last)*

- File "/home/hunter/.local/lib/python2.7/site-packages/flask/app.py",
line *1997*, in __call__

return self.wsgi_app(environ, start_response)

- File "/home/hunter/.local/lib/python2.7/site-packages/flask/app.py",
line *1985*, in wsgi_app

response = self.handle_exception(e)

- File "/home/hunter/.local/lib/python2.7/site-packages/flask/app.py",
line *1540*, in handle_exception

reraise(exc_type, exc_value, tb)

- File "/home/hunter/.local/lib/python2.7/site-packages/flask/app.py",
line *1982*, in wsgi_app

response = self.full_dispatch_request()

- File "/home/hunter/.local/lib/python2.7/site-packages/flask/app.py",
line *1614*, in full_dispatch_request

rv = self.handle_user_exception(e)

- File "/home/hunter/.local/lib/python2.7/site-packages/flask/app.py",
line *1517*, in handle_user_exception

reraise(exc_type, exc_value, tb)

- File "/home/hunter/.local/lib/python2.7/site-packages/flask/app.py",
line *1612*, in full_dispatch_request

rv = self.dispatch_request()

- File "/home/hunter/.local/lib/python2.7/site-packages/flask/app.py",
line *1598*, in dispatch_request

return self.view_functions[rule.endpoint](**req.view_args)

- File
"/home/hunter/.local/lib/python2.7/site-packages/flask_login/utils.py",
line *260*, in decorated_view

return current_app.login_manager.unauthorized()

- File
"/home/hunter/.local/lib/python2.7/site-packages/flask_login/login_manager.py",
line *152*, in unauthorized

return self.unauthorized_callback()

- File "/var/www/flask/pgadmin4/pgadmin4/web/pgadmin/utils/session.py",
line *318*, in pga_unauthorised

login_message = lm.localize_callback(lm.login_message)

- File
"/home/hunter/.local/lib/python2.7/site-packages/werkzeug/local.py",
line *375*, in <lambda>

__call__ = lambda x, *a, **kw: x._get_current_object()(*a, **kw)

- File
"/home/hunter/.local/lib/python2.7/site-packages/flask_babelex/__init__.py",
line *533*, in gettext

t = self.get_translations()

- File
"/home/hunter/.local/lib/python2.7/site-packages/flask_babelex/__init__.py",
line *510*, in get_translations

locale = get_locale()

- File
"/home/hunter/.local/lib/python2.7/site-packages/flask_babelex/__init__.py",
line *224*, in get_locale

locale = babel.load_locale(rv)

AttributeError: 'Babel' object has no attribute 'load_locale'

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