Autoload error

Module 'MagePal_GmailSmtpApp' from '/chroot/home/jumbosho/jumboshoppers.com/html/app/code/MagePal/GmailSmtpApp' has been already defined in '/chroot/home/jumbosho/jumboshoppers.com/html/app/code/MagePal/GoogleTagManager'.