Hello, 

I get the following error when i want to create new user :

You cannot create a new user from here.
To create new user please go to configuration panel.

I have created a new class which inherit to class user. It contains override creation function.

ef create(self, vals):

    # Check email if exist
    exis_email_id = self.env['res.users'].search([('email', '=', vals['email'].lower())])

   
    if exis_email_id:
        # raise osv.except_osv(('Invalid Action!'), ('Email already exist.'))
        raise osv.except_osv(('Invalid Action!'), ('Email already exist.'))

    else:

        res = super(User, self).create(vals)
        user_group_admin = self.env.ref('base.group_system')
        #If user is distributeur, Created user will be client
        if self.env.user.has_group('base.group_system'):
           self.env['res.users'].create({
             #'groups_id': [4, self.ref('affichage2.group_information_client')],
             #'groups_id': [(6, 0, [self.ref('affichage2.group_information_client')])],
             'groups_id': [(6, 0, [user_group_admin.id])],
             'name': vals['name'],
             #'login': vals['login'],
             'email': vals['email'],
           })

    return res