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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
http://www.google.comto search for answers for your question, they are there
Good luck!