Odoo Server Error

Traceback (most recent call last):
  File "/home/odoo/src/odoo/odoo/addons/base/models/ir_http.py", line 237, in _dispatch
    result = request.dispatch()
  File "/home/odoo/src/odoo/odoo/http.py", line 683, in dispatch
    result = self._call_function(**self.params)
  File "/home/odoo/src/odoo/odoo/http.py", line 359, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/home/odoo/src/odoo/odoo/service/model.py", line 94, in wrapper
    return f(dbname, *args, **kwargs)
  File "/home/odoo/src/odoo/odoo/http.py", line 347, in checked_call
    result = self.endpoint(*a, **kw)
  File "/home/odoo/src/odoo/odoo/http.py", line 912, in __call__
    return self.method(*args, **kw)
  File "/home/odoo/src/odoo/odoo/http.py", line 531, in response_wrap
    response = f(*args, **kw)
  File "/home/odoo/src/odoo/addons/web/controllers/main.py", line 1393, in call_button
    action = self._call_kw(model, method, args, kwargs)
  File "/home/odoo/src/odoo/addons/web/controllers/main.py", line 1381, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "/home/odoo/src/odoo/odoo/api.py", line 396, in call_kw
    result = _call_kw_multi(method, model, args, kwargs)
  File "/home/odoo/src/odoo/odoo/api.py", line 383, in _call_kw_multi
    result = method(recs, *args, **kwargs)
  File "/home/odoo/src/odoo/addons/portal/wizard/portal_wizard.py", line 58, in action_apply
    self.user_ids.action_apply()
  File "/home/odoo/src/odoo/addons/portal/wizard/portal_wizard.py", line 144, in action_apply
    user_portal = wizard_user.sudo().with_company(company_id)._create_user()
  File "/home/odoo/src/odoo/addons/portal/wizard/portal_wizard.py", line 167, in _create_user
    return self.env['res.users'].with_context(no_reset_password=True)._create_user_from_template({
  File "/home/odoo/src/odoo/addons/auth_signup/models/res_users.py", line 138, in _create_user_from_template
    raise ValueError(_('Signup: invalid template user'))
Exception

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

Traceback (most recent call last):
  File "/home/odoo/src/odoo/odoo/http.py", line 639, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/home/odoo/src/odoo/odoo/http.py", line 315, in _handle_exception
    raise exception.with_traceback(None) from new_cause
ValueError: Inscription : Utilisateur de modèle non valide