images->deleteAll() cause images not saved

[fliwire]

why deleteAll() not working ? 

$u = user();
$u->of(false);

$files = explode("|", $form->get("images2")->value);

if($files) {
	$u->images->deleteAll(); // just want to one image, delete all images. - if delete this line images added.

  foreach($files as $file) {
    if($file && file_exists($upload_path . $file)){
      $u->images->add($upload_path . $file);
      unlink($upload_path . $file);
    }
  }
}

$u->save();

// $u->images->deleteAll() not working so i used this.
$u->images->delete($u->images->eq(0));
$u->save();

[fliwire]

solved. forgot to add destinationPath to images2 field.