[doanthuy]

hi,
Do you update magento 1.9.2.0? if true, you need make these steps:
1, Go to sns_nova\app\code\local\Sns\Nova\etc\config.xml
2, Go to line 85, replace code:
<routers>
<adminhtml>
<args>
<modules>
<Sns_Nova before=”Mage_Adminhtml”>Sns_Nova_Adminhtml</Sns_Nova>
</modules>
</args>
</adminhtml>
</routers>

by code:

<routers>
<nova>
<use>admin</use>
<args>
<module>Sns_Nova</module>
<frontName>nova</frontName>
</args>
</nova>
<adminhtml>
<args>
<modules>
<Sns_Nova before=”Mage_Adminhtml”>Sns_Nova_Adminhtml</Sns_Nova>
</modules>
</args>
</adminhtml>
</routers>

3, Go to admin >> System >> Cache Management >> delete cache
4, Go to admin >> System >> Index Management >> Reindex Data