Hi Mireille! Thanks for using my module. From what you have listed, I don’t know why it is giving you an error, except for the fact that all my extensions were designed for PHP 5.3+, and your setup uses PHP 4.4.9, which doesn’t meet the minimum requirements.
To be honest, from what I can figure out from researching the Internet, the fact that you are using PHP4 is precisely the reason why you are getting those errors. The private and public accessor modifier keywords are PHP5 features and will throw this kind of error when run in PHP4. So, your only solution is to upgrade the PHP on your hosting to PHP 5.3+.
Hope this helps. Here is a similar post of the issue.