hi,
Have you upgraded to magento1.9.2.0? if true,you need make these steps:
1, go to sns_avaz\app\code\core\Mage\Install\Model\Installer.php
2, go to line 142 replace:
public function installConfig($data)
{
$data[‘db_active’] = true;

$data = Mage::getSingleton(‘install/installer_db’)->checkDbConnectionData($data);

Mage::getSingleton(‘install/installer_config’)
->setConfigData($data)
->install();
return $this;
}

by:

public function installConfig($data)
{
$data[‘db_active’] = true;

$data = Mage::getSingleton(‘install/installer_db’)->checkDbConnectionData($data);

Mage::getSingleton(‘install/installer_config’)
->setConfigData($data)
->install();
//Added by SNSTheme.Com : to install sample DB for quickstart package
Mage::getSingleton(‘install/installer_Sample’)->installSampleDB($data);
//end added by SNSTheme.Com
return $this;
}