I am getting this error in the log 

2023-08-01 14:03:07,989 23870 ERROR "Database_name" odoo.http: Exception during JSON request handling.

Traceback (most recent call last):

File "/odoo/odoo-server/odoo/http.py", line 624, in _handle_exception

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

File "/odoo/odoo-server/odoo/http.py", line 310, in _handle_exception

raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])

File "/odoo/odoo-server/odoo/tools/pycompat.py", line 14, in reraise

raise value

File "/odoo/odoo-server/odoo/http.py", line 669, in dispatch

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

File "/odoo/odoo-server/odoo/http.py", line 350, in _call_function

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

File "/odoo/odoo-server/odoo/service/model.py", line 94, in wrapper

return f(dbname, *args, **kwargs)

File "/odoo/odoo-server/odoo/http.py", line 339, in checked_call

result = self.endpoint(*a, **kw)

File "/odoo/odoo-server/odoo/http.py", line 915, in __call__

return self.method(*args, **kw)

File "/odoo/odoo-server/odoo/http.py", line 515, in response_wrap

response = f(*args, **kw)

File "/odoo/odoo-server/addons/hr_presence/controllers/bus_controller.py", line 24, in poll

return super(BusController, self).poll(channels, last, options=options)

File "/odoo/odoo-server/odoo/http.py", line 515, in response_wrap

response = f(*args, **kw)

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

raise Exception("bus.Bus unavailable")

Exception: bus.Bus unavailable