Fix Drupal site

General information for the website: Drupal site with Open Atrium plugin
Kind of development: Customization of existing website
Num. of web pages/modules: 1
Description of every page/module: Due to the previous web agency going bust, we've had to migrate the site/intranet to a new server. The database is up to date, but the filesystem is a few months out of date. We don't mind losing what we've uploaded since then, but we need the site working again.

The site has been migrated, but we have an error showing: Parse error: syntax error, unexpected ':' in /httpdocs/includes/common.inc on line 1347.

I was thinking that we may have installed some modules since the last back-up, so they could be installed, but the files not there - hense the error. I'm sure a Drupal specialist will be able to find that in no time at all.
Description of requirements/features: Fix the site - Install the modules that are enabled, but the files not there.
Extra notes: