Good morning,
It’s new enough for us, and we’re new to Odoo.
We installed Odoo 15 Community on a VPS server.
We have this concern about the module "Contact" when we want to consult a profile

Error : 

RPC_ERROR

Traceback (most recent call last):
  File "/odoo/odoo-server/odoo/api.py", line 886, in get
    return field_cache[record._ids[0]]
KeyError: 2

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/odoo/odoo-server/odoo/fields.py", line 1057, in __get__
    value = env.cache.get(record, self)
  File "/odoo/odoo-server/odoo/api.py", line 889, in get
    raise CacheMiss(record, field)
odoo.exceptions.CacheMiss: 'res.partner(2,).ticket_count'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/odoo/odoo-server/odoo/tools/cache.py", line 85, in lookup
    r = d[key]
  File "/odoo/odoo-server/odoo/tools/func.py", line 71, in wrapper
    return func(self, *args, **kwargs)
  File "/odoo/odoo-server/odoo/tools/lru.py", line 34, in __getitem__
    a = self.d[obj]
KeyError: ('ir.rule', , 2, False, 'helpdesk.ticket', 'read', ((2,), None))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/odoo/odoo-server/odoo/tools/safe_eval.py", line 330, in safe_eval
    return unsafe_eval(c, globals_dict, locals_dict)
  File "", line 1, in 
  File "/odoo/odoo-server/odoo/fields.py", line 4061, in __get__
    raise ValueError("Expected singleton: %s" % record)
ValueError: Expected singleton: helpdesk.team(5, 3, 4)

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/odoo/odoo-server/odoo/addons/base/models/ir_http.py", line 237, in _dispatch
    result = request.dispatch()
  File "/odoo/odoo-server/odoo/http.py", line 688, in dispatch
    result = self._call_function(**self.params)
  File "/odoo/odoo-server/odoo/http.py", line 360, 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 349, in checked_call
    result = self.endpoint(*a, **kw)
  File "/odoo/odoo-server/odoo/http.py", line 917, in __call__
    return self.method(*args, **kw)
  File "/odoo/odoo-server/odoo/http.py", line 536, in response_wrap
    response = f(*args, **kw)
  File "/odoo/odoo-server/addons/web/controllers/main.py", line 1348, in call_kw
    return self._call_kw(model, method, args, kwargs)
  File "/odoo/odoo-server/addons/web/controllers/main.py", line 1340, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "/odoo/odoo-server/odoo/api.py", line 464, in call_kw
    result = _call_kw_multi(method, model, args, kwargs)
  File "/odoo/odoo-server/odoo/api.py", line 451, in _call_kw_multi
    result = method(recs, *args, **kwargs)
  File "/odoo/odoo-server/odoo/models.py", line 3227, in read
    return self._read_format(fnames=fields, load=load)
  File "/odoo/odoo-server/odoo/models.py", line 3247, in _read_format
    vals[name] = convert(record[name], record, use_name_get)
  File "/odoo/odoo-server/odoo/models.py", line 5885, in __getitem__
    return self._fields[key].__get__(self, type(self))
  File "/odoo/odoo-server/odoo/fields.py", line 1106, in __get__
    self.compute_value(recs)
  File "/odoo/odoo-server/odoo/fields.py", line 1265, in compute_value
    records._compute_field_value(self)
  File "/odoo/odoo-server/addons/mail/models/mail_thread.py", line 411, in _compute_field_value
    return super()._compute_field_value(field)
  File "/odoo/odoo-server/odoo/models.py", line 4255, in _compute_field_value
    getattr(self, field.compute)()
  File "/odoo/custom/addons/website_axis_helpdesk/models/res_partner.py", line 20, in _compute_ticket_count
    groups = self.env['helpdesk.ticket'].read_group(
  File "/odoo/odoo-server/odoo/models.py", line 2438, in read_group
    result = self._read_group_raw(domain, fields, groupby, offset=offset, limit=limit, orderby=orderby, lazy=lazy)
  File "/odoo/odoo-server/odoo/models.py", line 2484, in _read_group_raw
    self._apply_ir_rules(query, 'read')
  File "/odoo/odoo-server/odoo/models.py", line 4480, in _apply_ir_rules
    domain = Rule._compute_domain(self._name, mode)
  File "", line 2, in _compute_domain
  File "/odoo/odoo-server/odoo/tools/cache.py", line 90, in lookup
    value = d[key] = self.method(*args, **kwargs)
  File "/odoo/odoo-server/odoo/addons/base/models/ir_rule.py", line 148, in _compute_domain
    dom = safe_eval(rule.domain_force, eval_context) if rule.domain_force else []
  File "/odoo/odoo-server/odoo/tools/safe_eval.py", line 346, in safe_eval
    raise ValueError('%s: "%s" while evaluating\n%r' % (ustr(type(e)), ustr(e), expr))
Exception

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/odoo/odoo-server/odoo/http.py", line 644, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/odoo/odoo-server/odoo/http.py", line 302, in _handle_exception
    raise exception.with_traceback(None) from new_cause
ValueError: : "Expected singleton: helpdesk.team(5, 3, 4)" while evaluating
"[ '|','&',('partner_id', '=',user.partner_id.id),('user_id','=',user.id),'|',('team_id','=',user.helpdesk_team_ids.id),('team_id','=',False)]"

Odoo Server Error