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    Fatal error: Class 'Mage_Hellothemes_Helper_Data' not found in magento/app/Mage.php on line 523

    I just uploaded the Extension Hello Upload.
    My spanish is pretty bad so i followed the not existing instructions in the TXT.
    I cant see the Extension, my first suggestion delete cache, and then this failure come.
    My Version numer is 1.4.01