PHP包括抛出include_path错误

I'm trying to use some include statements on my website and having some issues:

Here's the error:

Failed opening '../connection.php' for inclusion (include_path='.;C:\Users\Administrator\Dropbox\www') in C:\Users\Administrator\Dropbox\www etwork\core\user\UserAccount.php on line 6

Original include_path was looking in the xamp PEAR directory, i tried changing this using

    set_include_path('.;C:\Users\Administrator\Dropbox\www');

My server is configured to run straight off of my dropbox.