RPC_ERROR
Odoo Server Error
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/odoo/http.py", line 1584, in _serve_db
return service_model.retrying(self._serve_ir_http, self.env)
File "/usr/lib/python3/dist-packages/odoo/service/model.py", line 134, in retrying
result = func()
File "/usr/lib/python3/dist-packages/odoo/http.py", line 1611, in _serve_ir_http
response = self.dispatcher.dispatch(rule.endpoint, args)
File "/usr/lib/python3/dist-packages/odoo/http.py", line 1808, in dispatch
result = self.request.registry['ir.http']._dispatch(endpoint)
File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_http.py", line 154, in _dispatch
result = endpoint(**request.params)
File "/usr/lib/python3/dist-packages/odoo/http.py", line 699, in route_wrapper
result = endpoint(self, *args, **params_ok)
File "/usr/lib/python3/dist-packages/odoo/addons/web/controllers/dataset.py", line 42, in call_kw
return self._call_kw(model, method, args, kwargs)
File "/usr/lib/python3/dist-packages/odoo/addons/web/controllers/dataset.py", line 33, in _call_kw
return call_kw(request.env[model], method, args, kwargs)
File "/usr/lib/python3/dist-packages/odoo/api.py", line 461, in call_kw
result = _call_kw_multi(method, model, args, kwargs)
File "/usr/lib/python3/dist-packages/odoo/api.py", line 448, in _call_kw_multi
result = method(recs, *args, **kwargs)
File "/usr/lib/python3/dist-packages/odoo/addons/mail/models/ir_model.py", line 58, in unlink
return super(IrModel, self).unlink()
File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_model.py", line 303, in unlink
self.field_id._prepare_update()
File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_model.py", line 795, in _prepare_update
field = self.pool[record.model]._fields[record.name]
KeyError: 'x_PD037865086766507905'

The above server error caused the following client error:
RPC_ERROR: Odoo Server Error
RPCError@https://marcos.openerp.es/web/assets/192-f3a2895/web.assets_backend.min.js:964:274
makeErrorFromResponse@https://marcos.openerp.es/web/assets/192-f3a2895/web.assets_backend.min.js:968:163
jsonrpc/promise