What good is Cpanel going to do, if there are errors in the script??
Just looking for more info about the server and services.
open config.php (the one referenced in the fatal error on the linked page) in a text editor and find line 44 where the C:\... part is and change that to point to the proper directory where Smarty.class.php is.
Also check to see if there are any other places where the C: is and make changes accordingly. But before making these changes, you may want to make a backup copy of the files. (always make backups)
Also check in your CPanel and see what options are available for php. Sometimes server hosts will shut off options by default and it could be stopping the program from running. Check the requirements for your program and make sure they match up with the available options on the server. I've never seen the ffmpeg extension for php, so it may be something you have to install. Did it come with your program?