致命错误：第546行/home/naijaga1/public_html/app/Mage.php中找不到“Mage_Eco_Bank_Helper_Data”类

I am facing problem in my magento admin : Fatal error: Class 'Mage_Eco_Bank_Helper_Data' not found in /home/naijaga1/public_html/app/Mage.php on line 546

Please help me by writing solution

EDIT code:

public static function helper($name) { 
   $registryKey = '_helper/' . $name; 

   if (!self::registry($registryKey)) {
      $helperClass = self::getConfig()->getHelperClassName($name);                   
      self::register($registryKey, new $helperClass); 
   } 

return self::registry($registryKey); 
}

thanks