Dear Sanny,
This means that you have safe_mode enabled in PHP and you can only access files in certain directories. To resolved this you need to add the path /tmp to the list of allowed paths in php.ini. Maybe your hosting provider need to do this, it depends on your type of hosting:
http://www.php.net/manual/en/ini.sect.safe-mode.php#ini.safe-mode-include-dir
Please let me know if you are satisfied with my answer and if I can help you with any other questions you might have.
Regards,
Caridad