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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