Error on New Account Activation screen

Hello,

After a user signs up for a new blog the link in their confirmation email sends them to the activation screen. Everything works fine but there is this error on the top of the page:

Warning: array_flip() [function.array-flip]: The argument should be an array in /home/myfitbod/public_html/wp-content/plugins/blogtemplates/blogtemplatesfiles/blog_templates.php on line 597

Warning: Invalid argument supplied for foreach() in /home/myfitbod/public_html/wp-content/plugins/blogtemplates/blogtemplatesfiles/blog_templates.php on line 603

thanks