Extension talk:BucketVoting

I'm getting the following error trying to install the extension:

Warning: call_user_func_array: First argument is expected to be a valid callback, 'wfBuckVoting_DatabaseSetup' was given in /var/www/htdocs/opencms-wiki/includes/Hooks.php on line 133 Detected bug in an extension! Hook wfBuckVoting_DatabaseSetup failed to return a value; should return true to continue hook processing or false to abort. Backtrace:
 * 1) 0 /var/www/htdocs/opencms-wiki/maintenance/updaters.inc(1111): wfRunHooks('LoadExtensionSc...')
 * 2) 1 /var/www/htdocs/opencms-wiki/maintenance/update.php(44): do_all_updates(false, true)
 * 3) 2 {main}

Any ideas?