Hello I got a big problem one I installed your product. Need Help!!!!!!

I got an error in setup config of an odoo session.

The error message was shown like this *** I can' even change anything in configuration page!*** 

HELPPPP

Error:

Odoo Server Error

Traceback (most recent call last):

  File "C:\Program Files\Odoo14\server\odoo\addons\base\models\ir_http.py", line 237, in _dispatch

    result = request.dispatch()

  File "C:\Program Files\Odoo14\server\odoo\http.py", line 683, in dispatch

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

  File "C:\Program Files\Odoo14\server\odoo\http.py", line 359, in _call_function

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

  File "C:\Program Files\Odoo14\server\odoo\service\model.py", line 94, in wrapper

    return f(dbname, *args, **kwargs)

  File "C:\Program Files\Odoo14\server\odoo\http.py", line 347, in checked_call

    result = self.endpoint(*a, **kw)

  File "C:\Program Files\Odoo14\server\odoo\http.py", line 912, in __call__

    return self.method(*args, **kw)

  File "C:\Program Files\Odoo14\server\odoo\http.py", line 531, in response_wrap

    response = f(*args, **kw)

  File "C:\Program Files\Odoo14\server\odoo\addons\web\controllers\main.py", line 1389, in call_kw

    return self._call_kw(model, method, args, kwargs)

  File "C:\Program Files\Odoo14\server\odoo\addons\web\controllers\main.py", line 1381, in _call_kw

    return call_kw(request.env[model], method, args, kwargs)

  File "C:\Program Files\Odoo14\server\odoo\api.py", line 394, in call_kw

    result = _call_kw_model_create(method, model, args, kwargs)

  File "C:\Program Files\Odoo14\server\odoo\api.py", line 374, in _call_kw_model_create

    result = method(recs, *args, **kwargs)

  File "<decorator-gen-95>", line 2, in create

  File "C:\Program Files\Odoo14\server\odoo\api.py", line 323, in _model_create_single

    return create(self, arg)

  File "C:\Program Files\Odoo14\server\odoo\addons\base\models\res_config.py", line 783, in create

    return super(ResConfigSettings, self).create(values)

  File "<decorator-gen-64>", line 2, in create

  File "C:\Program Files\Odoo14\server\odoo\api.py", line 344, in _model_create_multi

    return create(self, [arg])

  File "C:\Program Files\Odoo14\server\odoo\addons\base\models\ir_fields.py", line 533, in create

    recs = super().create(vals_list)

  File "<decorator-gen-13>", line 2, in create

  File "C:\Program Files\Odoo14\server\odoo\api.py", line 345, in _model_create_multi

    return create(self, arg)

  File "C:\Program Files\Odoo14\server\odoo\models.py", line 3825, in create

    raise ValueError("Invalid field %r on model %r" % (key, self._name))

Exception

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

Traceback (most recent call last):

  File "C:\Program Files\Odoo14\server\odoo\http.py", line 639, in _handle_exception

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

  File "C:\Program Files\Odoo14\server\odoo\http.py", line 315, in _handle_exception

    raise exception.with_traceback(None) from new_cause

ValueError: Invalid field 'alias_prefix' on model 'res.config.settings'

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