Php Script Problemo

[liunx]

okay..so here is the deal...i've got this program and part of it says to do this:<br /><!--c1--><div class='codetop'>CODE</div><div class='codemain'><!--ec1-->//$tempdir = "/path/to/temp/dir/"; // needed for cache files. chmod 777 some dir.<br />$tempdir = "/temp";<!--c2--></div><!--ec2--><br /><br />so i did that i get this error:<br /><br />Warning: fopen(/temp/cache.cac) [function.fopen]: failed to create stream: No such file or directory in /home/username/public_html/dir/file.php on line 38<br /><br />now i know that that file and directory are there because im looking at them right now...anywho...suggestions anyone?<!--content-->