Error:
Odoo Server Error

Traceback (most recent call last):
  File "/data/build/odoo/odoo/http.py", line 677, in dispatch
    result = self._call_function(**self.params)
  File "/data/build/odoo/odoo/http.py", line 353, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/data/build/odoo/odoo/service/model.py", line 93, in wrapper
    return f(dbname, *args, **kwargs)
  File "/data/build/odoo/odoo/http.py", line 346, in checked_call
    result = self.endpoint(*a, **kw)
  File "/data/build/odoo/odoo/http.py", line 922, in __call__
    return self.method(*args, **kw)
  File "/data/build/odoo/odoo/http.py", line 523, in response_wrap
    response = f(*args, **kw)
  File "/data/build/odoo/addons/web/controllers/main.py", line 1273, in search_read
    return self.do_search_read(model, fields, offset, limit, domain, sort)
  File "/data/build/odoo/addons/web/controllers/main.py", line 1292, in do_search_read
    return Model.web_search_read(domain, fields, offset=offset, limit=limit, order=sort)
  File "/data/build/odoo/addons/web/models/models.py", line 37, in web_search_read
    records = self.search_read(domain, fields, offset=offset, limit=limit, order=order)
  File "/data/build/odoo/odoo/models.py", line 4848, in search_read
    result = records.read(fields)
  File "/data/build/odoo/odoo/models.py", line 2926, in read
    vals[name] = convert(record[name], record, use_name_get)
  File "/data/build/odoo/odoo/models.py", line 5650, in __getitem__
    return self._fields[key].__get__(self, type(self))
  File "/data/build/odoo/odoo/fields.py", line 990, in __get__
    self.compute_value(recs)
  File "/data/build/odoo/odoo/fields.py", line 1107, in compute_value
    records._compute_field_value(self)
  File "/data/build/odoo/odoo/models.py", line 3919, in _compute_field_value
    getattr(self, field.compute)()
  File "/data/build/enterprise/dedup/models/dedup_record.py", line 81, in _compute_field_values
    record.field_values = ', '.join([v for k,v in record._render_values(to_read).items()])
  File "/data/build/enterprise/dedup/models/dedup_record.py", line 70, in _render_values
    record_data = record.read(to_read)[0]
  File "/data/build/odoo/odoo/models.py", line 2904, in read
    raise ValueError("Invalid field %r on model %r" % (name, self._name))
Exception

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

Traceback (most recent call last):
  File "/data/build/odoo/odoo/http.py", line 632, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/data/build/odoo/odoo/http.py", line 317, in _handle_exception
    raise exception.with_traceback(None) from new_cause
ValueError: Invalid field 'contact_name' on model 'res.country.state'