DMSguestbook issues need help with

IF you go to the webpage I made from wordpress Here and go to the guestbook link you will see an error. I went and checked out the page it told me foreach ($query2 as $dbresult) { and now I am stumped of what to do. What is suppose to say? Also if you don’t want to see the book the the message is Warning: Invalid argument supplied for foreach() in /home/jakerobi/public_html/WordPress1/wp-content/plugins/dmsguestbook/dmsguestbook.php on line 378
So anyone know what I need to do?