Hi all , I am getting this error when i am trying to set workers greater than 0 .My project is deployed on AWS .I am usiing odoo V10 .

Kindly help .

File "/home/odoo/odoo-10.0/odoo/http.py", line 638, in _handle_exception

    return super(JsonRequest, self)._handle_exception(exception)

  File "/home/odoo/odoo-10.0/odoo/http.py", line 675, in dispatch

    result = self._call_function(**self.params)

  File "/home/odoo/odoo-10.0/odoo/http.py", line 331, in _call_function

    return checked_call(self.db, *args, **kwargs)

  File "/home/odoo/odoo-10.0/odoo/service/model.py", line 119, in wrapper

    return f(dbname, *args, **kwargs)

  File "/home/odoo/odoo-10.0/odoo/http.py", line 324, in checked_call

    result = self.endpoint(*a, **kw)

  File "/home/odoo/odoo-10.0/odoo/http.py", line 933, in __call__

    return self.method(*args, **kw)

  File "/home/odoo/odoo-10.0/odoo/http.py", line 504, in response_wrap

    response = f(*args, **kw)

  File "/home/odoo/odoo-10.0/addons/bus/controllers/main.py", line 35, in poll

    raise Exception("bus.Bus unavailable")

Exception: bus.Bus unavailable