[Plugin: Background Changer] Undeclared function error

Hi I’m trying to use this plugin, but I get the following error:

Fatal error: Call to undefined function: scandir() in /mnt/w0215/d20/s08/b027c063/www/wordpress09test/wp-content/plugins/background-control/background-control.php on line 182

Any suggestions?

http://wordpress.org/extend/plugins/background-changer/