Why do I get this error?

Traceback (most recent call last):
  File "C:\Users\emman\OneDrive\Desktop\odoo\odoov16\server\odoo\api.py", line 984, in get
    cache_value = field_cache[record._ids[0]]
KeyError: 482

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\emman\OneDrive\Desktop\odoo\odoov16\server\odoo\fields.py", line 1160, in __get__
    value = env.cache.get(record, self)
  File "C:\Users\emman\OneDrive\Desktop\odoo\odoov16\server\odoo\api.py", line 991, in get
    raise CacheMiss(record, field)
odoo.exceptions.CacheMiss: 'ir.actions.act_window(482,).search_view'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\emman\OneDrive\Desktop\odoo\odoov16\server\odoo\http.py", line 1584, in _serve_db
    return service_model.retrying(self._serve_ir_http, self.env)
  File "C:\Users\emman\OneDrive\Desktop\odoo\odoov16\server\odoo\service\model.py", line 133, in retrying
    result = func()
  File "C:\Users\emman\OneDrive\Desktop\odoo\odoov16\server\odoo\http.py", line 1611, in _serve_ir_http
    response = self.dispatcher.dispatch(rule.endpoint, args)
  File "C:\Users\emman\OneDrive\Desktop\odoo\odoov16\server\odoo\http.py", line 1815, in dispatch
    result = self.request.registry['ir.http']._dispatch(endpoint)
  File "C:\Users\emman\OneDrive\Desktop\odoo\odoov16\server\odoo\addons\base\models\ir_http.py", line 154, in _dispatch
    result = endpoint(**request.params)
  File "C:\Users\emman\OneDrive\Desktop\odoo\odoov16\server\odoo\http.py", line 697, in route_wrapper
    result = endpoint(self, *args, **params_ok)
  File "C:\Users\emman\OneDrive\Desktop\odoo\odoov16\server\odoo\addons\web\controllers\action.py", line 34, in load
    action = request.env[action_type].sudo().browse([action_id]).read()
  File "C:\Users\emman\OneDrive\Desktop\odoo\odoov16\server\odoo\addons\base\models\ir_actions.py", line 272, in read
    result = super(IrActionsActWindow, self).read(fields, load=load)
  File "C:\Users\emman\OneDrive\Desktop\odoo\odoov16\server\odoo\models.py", line 2986, in read
    return self._read_format(fnames=fields, load=load)
  File "C:\Users\emman\OneDrive\Desktop\odoo\odoov16\server\odoo\models.py", line 3165, in _read_format
    vals[name] = convert(record[name], record, use_name_get)
  File "C:\Users\emman\OneDrive\Desktop\odoo\odoov16\server\odoo\models.py", line 5898, in __getitem__
    return self._fields[key].__get__(self, type(self))
  File "C:\Users\emman\OneDrive\Desktop\odoo\odoov16\server\odoo\fields.py", line 1209, in __get__
    self.compute_value(recs)
  File "C:\Users\emman\OneDrive\Desktop\odoo\odoov16\server\odoo\fields.py", line 1387, in compute_value
    records._compute_field_value(self)
  File "C:\Users\emman\OneDrive\Desktop\odoo\odoov16\server\odoo\models.py", line 4222, in _compute_field_value
    fields.determine(field.compute, self)
  File "C:\Users\emman\OneDrive\Desktop\odoo\odoov16\server\odoo\fields.py", line 97, in determine
    return needle(*args)
  File "C:\Users\emman\OneDrive\Desktop\odoo\odoov16\server\odoo\addons\base\models\ir_actions.py", line 240, in _compute_search_view
    fvg = self.env[act.res_model].get_view(act.search_view_id.id, 'search')
  File "C:\Users\emman\OneDrive\Desktop\odoo\odoov16\server\odoo\api.py", line 537, in __getitem__
    return self.registry[model_name](self, (), ())
  File "C:\Users\emman\OneDrive\Desktop\odoo\odoov16\server\odoo\modules\registry.py", line 190, in __getitem__
    return self.models[model_name]
KeyError: 'hospital.patient'

The above server error caused the following client error:
RPC_ERROR: Odoo Server Error
    at makeErrorFromResponse (http://localhost:8015/web/assets/740-8a9c52a/web.assets_backend.min.js:992:163)
    at XMLHttpRequest. (http://localhost:8015/web/assets/740-8a9c52a/web.assets_backend.min.js:1000:13)

I get this error after editing the depends. 

    'depends': ['mail.thread', 'mail.activity.mixin'],

Is there anyway I can solve this? I'm trying to add a chatter in Odoo dev.