Following error comes whenever sales POS is being accessed.

Odoo Server Error

Traceback (most recent call last):

File "/odoo/odoo-server/odoo/http.py", line 640, in _handle_exception

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

File "/odoo/odoo-server/odoo/http.py", line 677, in dispatch

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

File "/odoo/odoo-server/odoo/http.py", line 333, in _call_function

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

File "/odoo/odoo-server/odoo/service/model.py", line 101, in wrapper

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

File "/odoo/odoo-server/odoo/http.py", line 326, in checked_call

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

File "/odoo/odoo-server/odoo/http.py", line 935, in __call__

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

File "/odoo/odoo-server/odoo/http.py", line 506, in response_wrap

response = f(*args, **kw)

File "/odoo/enterprise/addons/web/controllers/main.py", line 804, in search_read

return self.do_search_read(model, fields, offset, limit, domain, sort)

File "/odoo/enterprise/addons/web/controllers/main.py", line 826, in do_search_read

offset=offset or 0, limit=limit or False, order=sort or False)

File "/odoo/odoo-server/odoo/models.py", line 4699, in search_read

result = records.read(fields)

File "/odoo/odoo-server/odoo/models.py", line 3021, in read

values[name] = field.convert_to_read(record[name], record, use_name_get)

File "/odoo/odoo-server/odoo/models.py", line 5214, in __getitem__

return self._fields[key].__get__(self, type(self))

File "/odoo/odoo-server/odoo/fields.py", line 870, in __get__

self.determine_value(record)

File "/odoo/odoo-server/odoo/fields.py", line 981, in determine_value

self.compute_value(recs)

File "/odoo/odoo-server/odoo/fields.py", line 936, in compute_value

self._compute_value(records)

File "/odoo/odoo-server/odoo/fields.py", line 927, in _compute_value

getattr(records, self.compute)()

File "/odoo/enterprise/addons/point_of_sale/models/pos_config.py", line 141, in _compute_current_session

pos_config.current_session_id = session

File "/odoo/odoo-server/odoo/fields.py", line 888, in __set__

value = self.convert_to_cache(value, record)

File "/odoo/odoo-server/odoo/fields.py", line 1903, in convert_to_cache

raise ValueError("Wrong value for %s: %r" % (self, value))

ValueError: Wrong value for pos.config.current_session_id: pos.session(1548, 1547)