DPMA permissions problem

When I try to install my license key for DPMA, I get the following error. What should I do to resolve this?

FATAL ERROR

Failed to open file for license. Do you have the right permissions?

Trace Back

/var/www/html/admin/modules/digiumaddoninstaller/functions.inc.php:800 die_freepbx()
  [0]: Failed to open file for license. Do you have the right permissions?

/var/www/html/admin/modules/digiumaddoninstaller/functions.inc.php:561 digiumaddons_register->register()
  [0]: 
  [1]: DPMA-XXXXXXXXXXX
  [2]: dpma

/var/www/html/admin/modules/digiumaddoninstaller/functions.inc.php:519 digium_addons->register_register()
  [0]: 
  [1]: DPMA-XXXXXXXXXXX
  [2]: dpma

/var/www/html/admin/modules/digiumaddoninstaller/page.digiumaddons.php:112 digium_addons->register()
  [0]: dpma
  [1]: 
  [2]: DPMA-XXXXXXXXXXX

/var/www/html/admin/config.php:414 include()
  [0]: /var/www/html/admin/modules/digiumaddoninstaller/page.digiumaddons.php

What version of the Digium Addons module for FreePBX are you using?