Error : 404 not found Magento 1.8 Currency Symbol admin

Error : 404 not found Magento 1.8 Currency Symbol admin

Go to app/code/core/Mage/CurrencySymbol/etc/config.xml

<adminhtml>
    <args>
        <modules>
            <currencysymbol>Mage_CurrencySymbol_Adminhtml</currencysymbol>
            <currencysymbol after="Mage_Adminhtml">Mage_CurrencySymbol_Adminhtml</currencysymbol> // Add this new line
        </modules>
    </args>
</adminhtml>

Now go to app/etc/modules/Mage_CurrencySymbol.xml

<active>true</active>
<codePool>core</codePool>
    <depends>
        <Mage_Adminhtml />  // Add this new line
        <Mage_Widget/>
    </depends>
</Mage_CurrencySymbol>