cannot upload files to server

[eluser]vimeo[/eluser]
[quote author="jonez" date="1395577851"]What error message do you get?[/quote]

Code:

success page
<?php
      foreach ($upload_data as $item=>$value): ?>
      
      <?php endforeach; ?>

A PHP Error was encountered

Severity: Notice

Message: Undefined variable: upload_data

Filename: views/success.php

Line Number: 14

A PHP Error was encountered

Severity: Warning

Message: Invalid argument supplied for foreach()

Filename: views/success.php

Line Number: 14