While I am trying to covert Lead to Opportunity in CRM with Do not link to customer option, I have got this error. I am using Odoo 16.0.

Traceback (most recent call last):
  File "/opt/odoo/odoo/odoo/http.py", line 1638, in _serve_db
    return service_model.retrying(self._serve_ir_http, self.env)
  File "/opt/odoo/odoo/odoo/service/model.py", line 133, in retrying
    result = func()
  File "/opt/odoo/odoo/odoo/http.py", line 1665, in _serve_ir_http
    response = self.dispatcher.dispatch(rule.endpoint, args)
  File "/opt/odoo/odoo/odoo/http.py", line 1869, in dispatch
    result = self.request.registry['ir.http']._dispatch(endpoint)
  File "/opt/odoo/odoo/odoo/addons/base/models/ir_http.py", line 154, in _dispatch
    result = endpoint(**request.params)
  File "/opt/odoo/odoo/odoo/http.py", line 700, in route_wrapper
    result = endpoint(self, *args, **params_ok)
  File "/opt/odoo/odoo/addons/web/controllers/dataset.py", line 42, in call_kw
    return self._call_kw(model, method, args, kwargs)
  File "/opt/odoo/odoo/addons/web/controllers/dataset.py", line 33, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "/opt/odoo/odoo/odoo/api.py", line 466, in call_kw
    result = _call_kw_model_create(method, model, args, kwargs)
  File "/opt/odoo/odoo/odoo/api.py", line 444, in _call_kw_model_create
    result = method(recs, *args, **kwargs)
  File "", line 2, in create
  File "/opt/odoo/odoo/odoo/api.py", line 414, in _model_create_multi
    return create(self, [arg])
  File "/opt/odoo/odoo/odoo/addons/base/models/ir_fields.py", line 670, in create
    recs = super().create(vals_list)
  File "", line 2, in create
  File "/opt/odoo/odoo/odoo/api.py", line 415, in _model_create_multi
    return create(self, arg)
  File "/opt/odoo/odoo/odoo/models.py", line 3975, in create
    records = self._create(data_list)
  File "/opt/odoo/odoo/odoo/models.py", line 4133, in _create
    colval = field.convert_to_column(stored[fname], self, stored)
  File "/opt/odoo/odoo/odoo/fields.py", line 2723, in convert_to_column
    value = self.convert_to_cache(value, record)
  File "/opt/odoo/odoo/odoo/fields.py", line 2735, in convert_to_cache
    raise ValueError("Wrong value for %s: %r" % (self, value))
ValueError: Wrong value for crm.lead2opportunity.partner.action: 'nothing'

The above server error caused the following client error:
null