Hello,

I upgraded my odoo instance from 12 to 13 and I follow every instrunctions provided here:

https://odoo-development.readthedocs.io/en/latest/migration/migrate-odoo-12-to-13.html  

But when I try to install an app dependent by fleet app i receive this error:

Odoo Server Error

Traceback (most recent call last):
  File "/home/odoo_itaca/odoo/odoo/http.py", line 619, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/home/odoo_itaca/odoo/odoo/http.py", line 309, in _handle_exception
    raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
  File "/home/odoo_itaca/odoo/odoo/tools/pycompat.py", line 14, in reraise
    raise value
  File "/home/odoo_itaca/odoo/odoo/http.py", line 664, in dispatch
    result = self._call_function(**self.params)
  File "/home/odoo_itaca/odoo/odoo/http.py", line 345, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/home/odoo_itaca/odoo/odoo/service/model.py", line 93, in wrapper
    return f(dbname, *args, **kwargs)
  File "/home/odoo_itaca/odoo/odoo/http.py", line 338, in checked_call
    result = self.endpoint(*a, **kw)
  File "/home/odoo_itaca/odoo/odoo/http.py", line 909, in __call__
    return self.method(*args, **kw)
  File "/home/odoo_itaca/odoo/odoo/http.py", line 510, in response_wrap
    response = f(*args, **kw)
  File "/home/odoo_itaca/odoo/addons/web/controllers/main.py", line 1323, in call_button
    action = self._call_kw(model, method, args, kwargs)
  File "/home/odoo_itaca/odoo/addons/web/controllers/main.py", line 1311, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "/home/odoo_itaca/odoo/odoo/api.py", line 395, in call_kw
    result = _call_kw_multi(method, model, args, kwargs)
  File "/home/odoo_itaca/odoo/odoo/api.py", line 382, in _call_kw_multi
    result = method(recs, *args, **kwargs)
  File "<decorator-gen-58>", line 2, in button_immediate_install
  File "/home/odoo_itaca/odoo/odoo/addons/base/models/ir_module.py", line 72, in check_and_log
    return method(self, *args, **kwargs)
  File "/home/odoo_itaca/odoo/odoo/addons/base/models/ir_module.py", line 463, in button_immediate_install
    return self._button_immediate_function(type(self).button_install)
  File "/home/odoo_itaca/odoo/odoo/addons/base/models/ir_module.py", line 573, in _button_immediate_function
    modules.registry.Registry.new(self._cr.dbname, update_module=True)
  File "/home/odoo_itaca/odoo/odoo/modules/registry.py", line 85, in new
    odoo.modules.load_modules(registry._db, force_demo, status, update_module)
  File "/home/odoo_itaca/odoo/odoo/modules/loading.py", line 420, in load_modules
    loaded_modules, update_module, models_to_check)
  File "/home/odoo_itaca/odoo/odoo/modules/loading.py", line 312, in load_marked_modules
    perform_checks=perform_checks, models_to_check=models_to_check
  File "/home/odoo_itaca/odoo/odoo/modules/loading.py", line 194, in load_module_graph
    registry.setup_models(cr)
  File "/home/odoo_itaca/odoo/odoo/modules/registry.py", line 247, in setup_models
    model._setup_fields()
  File "/home/odoo_itaca/odoo/odoo/models.py", line 2676, in _setup_fields
    field.setup_full(self)
  File "/home/odoo_itaca/odoo/odoo/fields.py", line 420, in setup_full
    self._setup_related_full(model)
  File "/home/odoo_itaca/odoo/odoo/fields.py", line 473, in _setup_related_full
    field = target._fields[name]
KeyError: 'plan_to_change_car'

Some one can help me?

Have a nice day