i'm using odoo 11 and i develop a custom module to fix the stages in the "hr.applicant" model but it shows error ValueError: The _name attribute Applicant is not valid. Any idea for help please ?

Traceback

Traceback (most recent call last):
File "/opt/openhrms/odoo/http.py", line 651, in _handle_exception
return super(JsonRequest, self)._handle_exception(exception)
File "/opt/openhrms/odoo/http.py", line 310, in _handle_exception
raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
File "/opt/openhrms/odoo/tools/pycompat.py", line 87, in reraise
raise value
File "/opt/openhrms/odoo/http.py", line 693, in dispatch
result = self._call_function(**self.params)
File "/opt/openhrms/odoo/http.py", line 342, in _call_function
return checked_call(self.db, *args, **kwargs)
File "/opt/openhrms/odoo/service/model.py", line 97, in wrapper
return f(dbname, *args, **kwargs)
File "/opt/openhrms/odoo/http.py", line 335, in checked_call
result = self.endpoint(*a, **kw)
File "/opt/openhrms/odoo/http.py", line 937, in __call__
return self.method(*args, **kw)
File "/opt/openhrms/odoo/http.py", line 515, in response_wrap
response = f(*args, **kw)
File "/opt/openhrms/addons/web/controllers/main.py", line 938, in call_button
action = self._call_kw(model, method, args, {})
File "/opt/openhrms/addons/web/controllers/main.py", line 926, in _call_kw
return call_kw(request.env[model], method, args, kwargs)
File "/opt/openhrms/odoo/api.py", line 689, in call_kw
return call_kw_multi(method, model, args, kwargs)
File "/opt/openhrms/odoo/api.py", line 680, in call_kw_multi
result = method(recs, *args, **kwargs)
File "<decorator-gen-57>", line 2, in button_immediate_install
File "/opt/openhrms/odoo/addons/base/module/module.py", line 72, in check_and_log
return method(self, *args, **kwargs)
File "/opt/openhrms/odoo/addons/base/module/module.py", line 450, in button_immediate_install
return self._button_immediate_function(type(self).button_install)
File "/opt/openhrms/odoo/addons/base/module/module.py", line 552, in _button_immediate_function
modules.registry.Registry.new(self._cr.dbname, update_module=True)
File "/opt/openhrms/odoo/modules/registry.py", line 85, in new
odoo.modules.load_modules(registry._db, force_demo, status, update_module)
File "/opt/openhrms/odoo/modules/loading.py", line 380, in load_modules
loaded_modules, update_module, models_to_check)
File "/opt/openhrms/odoo/modules/loading.py", line 274, in load_marked_modules
perform_checks=perform_checks, models_to_check=models_to_check
File "/opt/openhrms/odoo/modules/loading.py", line 153, in load_module_graph
registry.init_models(cr, model_names, {'module': package.name})
File "/opt/openhrms/odoo/modules/registry.py", line 306, in init_models
model._auto_init()
File "/opt/openhrms/odoo/models.py", line 2180, in _auto_init
raise_on_invalid_object_name(self._name)
File "/opt/openhrms/odoo/models.py", line 97, in raise_on_invalid_object_name
raise ValueError(msg)
ValueError: The _name attribute Applicant is not valid.

hr_recruitment_view.py

<?xml version="1.0" encoding="utf-8"?>
<odoo>
<data noupdate="1">
    <record model="hr.recruitment.stage" id="default_stage_job">
        <field name="name">CV in progress</field>
        <field name="sequence">0</field>
    </record>

 </data>
</odoo>

hr_recruitment.py

 class Applicant(models.Model):
_inherit = "hr.applicant"

def _default_stage_id(self):
    # Search your stage
    stage_id = self.env['hr.recruitment.stage'].search([('name', '=', 'CV in progress')], limit=1).id
    if stage_id:
        return stage_id
    return super(Applicant, self)._default_stage_id()