HIa I have created a new user with sign in option. But when I'm triying to go to shop menu I'm getting :

500: Internal server Error,   with the next error in log:

 openerp.addons.base.ir.ir_model: Access Denied by ACLs for operation: read, uid: 7, model: product.attribute
2014-06-02 17:05:30,898 14594 ERROR MOTOSCOOT_NET openerp.addons.website.models.ir_http: 500 Internal Server Error:

Traceback (most recent call last):
  File "/opt/ODOO8/odoo/addons/website/models/ir_http.py", line 145, in _handle_exception
    return super(ir_http, self)._handle_exception(exception)
  File "/opt/ODOO8/odoo/openerp/addons/base/ir/ir_http.py", line 94, in _handle_exception
    return request._handle_exception(exception)
  File "/opt/ODOO8/odoo/openerp/addons/base/ir/ir_http.py", line 121, in _dispatch
    result = request.dispatch()
  File "/opt/ODOO8/odoo/openerp/http.py", line 549, in dispatch
    r = self._call_function(**self.params)
  File "/opt/ODOO8/odoo/openerp/http.py", line 299, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/opt/ODOO8/odoo/openerp/service/model.py", line 113, in wrapper
    return f(dbname, *args, **kwargs)
  File "/opt/ODOO8/odoo/openerp/http.py", line 296, in checked_call
    return self.endpoint(*a, **kw)
  File "/opt/ODOO8/odoo/openerp/http.py", line 664, in __call__
    return self.method(*args, **kw)
  File "/opt/ODOO8/odoo/openerp/http.py", line 348, in response_wrap
    response = f(*args, **kw)
  File "/opt/ODOO8/odoo/addons/website_sale/controllers/main.py", line 167, in shop
    attributes_ids = attributes_obj.search(cr, uid, [], context=request.context)
  File "/opt/ODOO8/odoo/openerp/osv/orm.py", line 1985, in search
    return self._search(cr, user, args, offset=offset, limit=limit, order=order, context=context, count=count)
  File "/opt/ODOO8/odoo/openerp/osv/orm.py", line 4629, in _search
    self.check_access_rights(cr, access_rights_uid or user, 'read')
  File "/opt/ODOO8/odoo/openerp/osv/orm.py", line 3611, in check_access_rights
    return self.pool.get('ir.model.access').check(cr, uid, self._name, operation, raise_exception)
  File "/opt/ODOO8/odoo/openerp/tools/cache.py", line 21, in lookup
    r = self.lookup(self2, cr, *args, **argv)
  File "/opt/ODOO8/odoo/openerp/tools/cache.py", line 49, in lookup
    value = d[key] = self.method(self2, cr, *args)
  File "/opt/ODOO8/odoo/openerp/addons/base/ir/ir_model.py", line 744, in check
    raise openerp.exceptions.AccessError(msg % msg_params)
AccessError: Lo siento, no est\xe1 autorizado para acceder a este documento. S\xf3lo usuarios con los siguientes permisos est\xe1n autorizados a hacer esto:
- Human Resources/Employee
    - Sales/Manager
    - Public

(Modelo de documento: product.attribute)

Whats wrong?? How the ecommerce client are created?