Seem like your hosting is php4, it is very simple to solve this, you have 2 ways:
1. Switch to php5 (no, you dont need to switch host at all, most hosts have 2 versions, You just need to specify you want to use php5 and they can help)
2. This is a hot fix and will fix things up right away for you:
Go to includes/classes/ssu/languages
Rename all files that have the extension .php to .php5, all files that have extension .php4 to .php

Regards