Fatal error: class "Magentothem_Sale_Helper_Data" not found in / home / project / public_html / app / Mage.php on line 547

I am struggling with one problem: Fatal error: Class

Magentothem_Sale_Helper_Data 'not found in / home / project / public _html / app / Mage.php on line 547

Here config.xml

<config>
    <modules>
        <Magentothem_Sale>
            <version>0.1.0</version>
        </Magentothem_Sale>
    </modules>
    <frontend>
        <routers>
            <sale>
                <use>standard</use>
                <args>
                    <module>Magentothem_Sale</module>
                    <frontName>sale</frontName>
                </args>
            </sale>
        </routers>
        <layout>
            <updates>
                <sale>
                    <file>sale.xml</file>
                </sale>
            </updates>
        </layout>
    </frontend>
    <global>
        <helpers>
            <sale>
                <class>Magentothem_Sale_Helper</class>
            </sale>
        </helpers>
    </global>
</config>

      

        
        
        
      

    

Here Helper/Data.php

: -

class Magentothem_Sale_Helper_Data extends Mage_Core_Helper_Abstract
{
}

      

        
        
        
      

    

Getting error - Fatal error: Class 'Magentothem_Sale_Helper_Data' not found

. Can't figure out where I am doing wrong.

Please, help.