Wikimedia Bugzilla is closed!

Get the following error message from log:
[09-May-2008 00:35:55] PHP Warning:  mkdir() [<a href='function.mkdir'>function.mkdir</a>]: No such file or directory in /MYDIR/wiki/includes/HTMLFileCache.php on line 114
[09-May-2008 00:35:55] PHP Warning:  mkdir() [<a href='function.mkdir'>function.mkdir</a>]: No such file or directory in /MYDIR/wiki/includes/HTMLFileCache.php on line 115


Seems like that in the file of HTMLFileCache.php, calling mkdir failed.
function checkCacheDirs() {
                $filename = $this->fileCacheName();
                $mydir2=substr($filename,0,strrpos($filename,'/')); # subdirectory level 2
                $mydir1=substr($mydir2,0,strrpos($mydir2,'/')); # subdirectory level 1

###THIS LINE                if(!file_exists($mydir1)) { mkdir($mydir1,0775); } # create if necessary
###AND　THIS LINE          if(!file_exists($mydir2)) { mkdir($mydir2,0775); }
        }