Vijay Singh on "Ad Inserter Not Working On My website !"

I just Installed Ad Inserter on My Web Mp3Ghost , It didnt work for me , showing this errror all over the web in the top

Warning: Illegal string offset 'ad1_displayType' in /home/minisong/public_html/wp-content/plugins/ad-inserter/class.php on line 56

Warning: Illegal string offset 'ad2_displayType' in /home/minisong/public_html/wp-content/plugins/ad-inserter/class.php on line 56

Please If Anyone Can help !

Thanks !

http://wordpress.org/plugins/ad-inserter/