Fatal error: Class 'Mage_Mtbelano_Helper_Data' when loading page - php

I'm helping my brother but unfortunately, I'm very very new to Magento but I'm good in PHP and Unix.
I would like to ask what this error is and how to fix it.
Fatal error: Class 'Mage_Mtbelano_Helper_Data' not found in /home/scott/public_html/app/Mage.php on line 547

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