protected function removeRole($name)
    {
        $role = $this->authManager->getRole($name);
        if (empty($role)) {
            throw new InvalidParamException("Role '{$role}' does not exists");
        }
        echo "    > removing role $role->name ...";
        $time = microtime(true);
        $this->authManager->remove($role);
        echo ' done (time: ' . sprintf('%.3f', microtime(true) - $time) . "s)\n";
    }