Fatal error: Call to a member function children() on a non-object

[hatim_jlidat]

hello

i am new in magento.

when i want to install a new template in an admin area 

1- list de install demo is empty

2- when I click submit action its gives me this :
Fatal error: Call to a member function children() on a non-object in /home/lalablue/public_html/app/code/local/Etheme/Coolbabyconfig/controllers/Adminhtml/LoadpresetconfigController.php on line 28

code of function children() in "LoadpresetconfigController.php" file

  public function configinstallAction()
    {
        $configset=$this->getRequest()->getParam('configset');
        $store=$this->getRequest()->getParam('store');
        $scope = $store ? 'stores' : 'default';
        $configxml=new Varien_Simplexml_Config(Mage::getBaseDir().'/cb_presets/'.$configset.'.xml');

        foreach($configxml->getNode('sections')->children() as $section)
        {
            foreach($section->children() as $group)
            {
                foreach($group->children() as $param)
                {
                    Mage::getConfig()->saveConfig($section->getName().'/'.$group->getName().'/'.$param->getName(), (string)$param, $scope, $store);
                }
            }
        }

how can i fixed it?

[MageWoo]

Hi @hatim_jlidat,

You bug caused by it cannot get result in the xml file. You should check the file "Mage::getBaseDir().'/cb_presets/'.$configset.'.xml'" again.

Hope it's helpful for you.

MageWoo