erro para deletar arquivo no php

erro que dar ???

E UM DIRETORIOWarning: chmod() [function.chmod]: Operation not permitted in /home/margenst/public_html/admin/teste4.php on line 12Warning: chmod() [function.chmod]: No such file or directory in /home/margenst/public_html/admin/teste4.php on line 17Warning: chmod() [function.chmod]: No such file or directory in /home/margenst/public_html/admin/teste4.php on line 17Warning: chmod() [function.chmod]: No such file or directory in /home/margenst/public_html/admin/teste4.php on line 17Warning: chmod() [function.chmod]: No such file or directory in /home/margenst/public_html/admin/teste4.php on line 17Warning: chmod() [function.chmod]: No such file or directory in /home/margenst/public_html/admin/teste4.php on line 17Warning: chmod() [function.chmod]: No such file or directory in /home/margenst/public_html/admin/teste4.php on line 17Warning: chmod() [function.chmod]: No such file or directory in /home/margenst/public_html/admin/teste4.php on line 17Warning: chmod() [function.chmod]: No such 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meu codigo<?$caminho="../prova/album/teste";if(Is_dir($caminho)) {echo " E UM DIRETORIO";}else {echo "nao achei esse dir";}chmod($caminho,0775);$images=scandir($caminho);$total=count($images);for($a=0;$a < $total;$a++) {chmod($images[$a],0775);}for($a=0;$a < $total;$a++) {unlink($images[$a]);}?>nao tenho ideia de como resolver isso no localhost funcionar de n maneras mais passou para o server ferra tudo um abraço kakaroto