mkdir() failed (Disk quota exceeded)

[yLee]

Hi

i'm trying create a directory using mkdir.

However i get a message:

Warning: mkdir() failed (Disk quota exceeded) in /home/newstand/public_html/admin/test.php on line 8
😕

The codes are:
$dir = "../FP_uploaded_files/1";

if( !(is_dir($dir)) )
{

if( !( mkdir($dir, 0757) ) )
{

  echo '<br><br>';
  echo 'unable to create ' . $dir;
  exit;

}

}

echo 'directory already exists';

the permission of FP_uploaded_files has been changed so that I have a permission to write
AND
I also have enough space.. exactly 191.77 Megabytes

I appreciate it if someone could tell me what's the PROBLEM

thanks