user error: Could not get style data

I am getting the following error when trying to embed phpBB3.0.7 in Drupal. I assume it has to do with theme/style but I am unsure how to proceed. (full file paths removed)

    * user error: Could not get style data in /phpBB3/includes/session.php on line 1630.
    * user error: Template path could not be found: styles//template in /phpBB3/includes/template.php on line 81.
    * user error: SQL ERROR [ mysqli ]

      [0]
      An SQL error occurred while fetching this page. Please contact the Board Administrator if this problem persists. in /phpBB3/includes/db/dbal.php on line 697.
    * user error: SQL ERROR [ mysqli ]
      [0]
      An SQL error occurred while fetching this page. Please contact the Board Administrator if this problem persists. in /phpBB3/includes/db/dbal.php on line 697.