File "/opt/odoo13/odoo/addons/web/controllers/main.py", line 1314, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "/opt/odoo13/odoo/odoo/api.py", line 387, in call_kw
    result = _call_kw_multi(method, model, args, kwargs)
  File "/opt/odoo13/odoo/odoo/api.py", line 374, in _call_kw_multi
    result = method(recs, *args, **kwargs)
  File "/opt/odoo13/odoo-custom-addons/asterisk_dialer/models/campaign.py", line 65, in set_running_button
    self.set_running(self.id)
  File "/opt/odoo13/odoo-custom-addons/asterisk_dialer/models/campaign.py", line 75, in set_running
    'result': ''
  File "/opt/odoo13/odoo/odoo/models.py", line 3489, in write
    raise ValueError("Invalid field %r on model %r" % (fname, self._name))
ValueError: Invalid field 'result' on model 'asterisk_dialer.campaign'