Simple Groupware error

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I have installed Simple Groupware on Debian Squeeze. Immediately upon installation I've got an error message:

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Error: SyntaxError: Unexpected token P

falsePhp Warning: 17/03/12 19:20:23 require(core/classes/sys.php): failed to open stream: No such file or directory /var/
www/www.example.com/web/bin/core/functions.php 124

Fatal error: require(): Failed opening required 'core/classes/sys.php' (include_path='.:/usr/share/php:/usr/share/pear')
in /var/www/www.example.com/web/bin/core/functions.php on line 124

folder_has_changed
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I didn't find its discussion in the forums. What's wrong? How to fix it?

Same error reported by a user at the bottom of page http://www.howtoforge.com/running-si...buntu-11.10-p2

[vistad]

The error described was in version 0.742. I installed the latest version - 0.745 - and it works fine.