probleme de creation des sous dossiers avec mkdir

voia mon code

$folders_to_make = array();
$folders_to_make[0] = JPATH_SITE.'/images/morfeoshow/';
$folders_to_make[1] = JPATH_SITE.'/images/morfeoshow/temp_upload/';
$folders_to_make[2] = JPATH_SITE.'/images/morfeoshow/' . $folder_name ;
$folders_to_make[3] = JPATH_SITE.'/images/morfeoshow/'. $folder_name . '/thumbs/';
$folders_to_make[4] = JPATH_SITE.'/images/morfeoshow/'. $folder_name . '/big/';
$folders_to_make[5] = JPATH_SITE.'/images/morfeoshow/'. $folder_name . '/xml/';
$folders_to_make[6] = JPATH_SITE.'/images/morfeoshow/'. $folder_name . '/mini/';

for($i = 0; $i < count($folders_to_make); $i++)
{
if ( !file_exists($folders_to_make[$i]) )
{
// if (! (mkdir($folders_to_make[$i], 0755)) )
if (! (mkdir($folders_to_make[$i], 0757)) )
{
JError::raise(2, 500, $folders_to_make[$i] . JText::_( 'ERROR: Folder could not be created' ) , '', false);
$errors ++;
}
else {
echo "dossier cree";
//chmod($folders_to_make[$i], 777);
}
}
}
alors le 1 dossier se crée mais ses sous dossiers non est j'ai une erreur
comment résoudre ce problème

Quel est l'erreur ?