I was trying to install a poll extension on a joomla 2.5 site and was getting a http 500 error. I stupidly decided to delete the extension files from the server using cPanel file manager… I accidently deleted simplepie thinking it was part of the extension and its not causing http 500 errors with my Joom Gallery extension.
Does anyone have any suggestions on how to restore the system files I deleted?
Install a local copy of Joomla + the extensions you deleted, and then use ftp to restore them to the server; in the future, try to use Joomla extension manager to install/uninstall extensions.