2
Seems that scripts can't include any files from _above_ directory.
Your hosting provider or system admin may have restrictions on which directories can use "includes."
Run phpinfo.php and do a find on "open_basedir." If the setting is something other than "no value" that is your problem. Check with your hosting provider.
And... Don't afraid to use
www.google.com
to search for answers for your question, they are there
Good luck!