How to delete a file selected by a dropdown list

[Dephyrius]

I have a dropdown list populated with files pulled from a directory using the PHP listed below then displayed on a page in textareas and am trying to figure out how I can delete them using a delete button in the form when they're selected.

<input type="hidden" name="Action" value="EDIT" /><input type="hidden" name="Selection"  id="Selection" value="-1"><div>Below is the list of your saved codes. To edit your codes, select it from the list.</div>
<select size="1" name="CodeList" id="CodeList">
<?php
   $directory = $directory = 'users/' . $_SESSION['username'];
   $filesContents = Array();
   $files = scandir( $directory ) ;
 
   foreach( $files as $file )
  {
   if ( ! is_dir( $file ) )
  {
   $filesContents[$file] = file_get_contents($directory , $file);
  echo "<option>" . $file . "</option>";
  }
   }
   ?>
 
delete php script.
 
<?php
   session_start();
    $directory = $directory = $_SERVER['DOCUMENT_ROOT'] . '/users/' . $_SESSION['username'];
    $file_to_delete = $_POST['CodeList'];
    if ( unlink ($directory.'/'.$file_to_delete) ) {
      echo $file_to_delete . " deleted.";
   } else {
echo "Error.";
}
?>

when I try and save I get the Warning: unlink(/myhome/root/public_html/users/Addiction/) [function.unlink]: No such file or directory in /home/revo/public_html/evo/avdeleteprocess.php on line 5 Error.

So its found the right folder, just not finding the file from the dropdown list selection.

Also edited to add I ran a var_dump($_POST) right after my delete script to see what it was pulling as the value of POST and it came back with: Error.array(1) { ["Action"]=> string(6) "Delete" }