Hi forum, i get this error:

raceback (most recent call last):
  File "/app/odoo/fields.py", line 948, in __get__
    value = record.env.cache.get(record, self)
  File "/app/odoo/api.py", line 967, in get
    value = self._data[key][field][record._ids[0]]
KeyError: 15

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/app/odoo/http.py", line 657, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/app/odoo/http.py", line 312, in _handle_exception
    raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
  File "/app/odoo/tools/pycompat.py", line 87, in reraise
    raise value
  File "/app/odoo/http.py", line 699, in dispatch
    result = self._call_function(**self.params)
  File "/app/odoo/http.py", line 344, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/app/odoo/service/model.py", line 97, in wrapper
    return f(dbname, *args, **kwargs)
  File "/app/odoo/http.py", line 337, in checked_call
    result = self.endpoint(*a, **kw)
  File "/app/extra_addons/smile_perf_analyzer/models/http.py", line 25, in __call__
    res = profile(native_call)(self, *args, **kwargs)
  File "/app/extra_addons/smile_perf_analyzer/tools/decorators.py", line 26, in wrapper
    return func(*args, **kwargs)
  File "/app/odoo/http.py", line 943, in __call__
    return self.method(*args, **kw)
  File "/app/odoo/http.py", line 517, in response_wrap
    response = f(*args, **kw)
  File "/app/addons/web/controllers/main.py", line 934, in call_kw
    return self._call_kw(model, method, args, kwargs)
  File "/app/addons/web/controllers/main.py", line 926, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "/app/odoo/api.py", line 687, in call_kw
    return call_kw_model(method, model, args, kwargs)
  File "/app/odoo/api.py", line 672, in call_kw_model
    result = method(recs, *args, **kwargs)
  File "/app/odoo/models.py", line 3409, in create
    record = self.browse(self._create(old_vals))
  File "/app/odoo/models.py", line 3566, in _create
    self.recompute()
  File "/app/extra_addons/smile_perf_analyzer/models/models.py", line 25, in recompute
    _recompute(self, field, recs)
  File "/app/extra_addons/smile_perf_analyzer/models/models.py", line 41, in _recompute
    vals = {n: rec[n] for n in ns}
  File "/app/extra_addons/smile_perf_analyzer/models/models.py", line 41, in 
    vals = {n: rec[n] for n in ns}
  File "/app/odoo/models.py", line 4803, in __getitem__
    return self._fields[key].__get__(self, type(self))
  File "/app/odoo/fields.py", line 952, in __get__
    self.determine_value(record)
  File "/app/odoo/fields.py", line 1041, in determine_value
    self.compute_value(recs)
  File "/app/odoo/fields.py", line 1019, in compute_value
    self._compute_value(records)
  File "/app/odoo/fields.py", line 1010, in _compute_value
    getattr(records, self.compute)()
  File "/app/extra_addons/models/hr_attendance_sheet.py", line 201, in _compute_delegation_info
    record.count_delegation_internal = self.env['hr.delegation'].search_count([('attendance_sheet_id', '=', self.id), ('delegation_type', '=', 'internal'), ('with_breakfast', '=', False)])
  File "/app/odoo/fields.py", line 2564, in __get__
    raise ValueError("Expected singleton: %s" % record)
ValueError: Expected singleton: hr.attendance.sheet(15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)

The  compute  method  who  get    this  error:

@api.multi
@api.depends('delegation_ids', 'exchange_rate_id', 'exchange_rate_amount', 'da_delegation_internal', 'da_delegation_internal_breakfast', 'da_delegation_external', 'da_delegation_external_breakfast')
def _compute_delegation_info(self):
    for record in self:
        record.count_delegation_internal = self.env['hr.delegation'].search_count([('attendance_sheet_id', '=', self.id), ('delegation_type', '=', 'internal'), ('with_breakfast', '=', False)])
        record.count_delegation_internal_breakfast = self.env['hr.delegation'].search_count([('attendance_sheet_id', '=', self.id), ('delegation_type', '=', 'internal'), ('with_breakfast', '=', True)])
        record.count_delegation_external = self.env['hr.delegation'].search_count([('attendance_sheet_id', '=', self.id), ('delegation_type', '=', 'external'), ('with_breakfast', '=', False)])
        record.count_delegation_external_breakfast = self.env['hr.delegation'].search_count([('attendance_sheet_id', '=', self.id), ('delegation_type', '=', 'external'), ('with_breakfast', '=', True)])
What  can  i  do  wrong?