Autoload error

Module 'MagePal_GmailSmtpApp' from '/home/admin/domains/eduksiazka.pl/public_html/app/code/MagePal/GmailSmtpApp_old' has been already defined in '/home/admin/domains/eduksiazka.pl/public_html/app/code/MagePal/GmailSmtpApp'.