WordPress Warning

I was trying to change my Header picture in File Manager. I went through my hosting site GoDaddy. I launched my domain name and went to Content then File Manager, there I went to the header section and deleted the photos that were there. I also tried uploading my logo as well. After I was done these two warnings popped up on my site.

Warning: Invalid argument supplied for foreach() in /home/content/70/6321270/html/wp-content/themes/atahualpa/functions/bfa_rotating_header_images.php on line 39

Warning: array_rand() [function.array-rand]: First argument has to be an array in /home/content/70/6321270/html/wp-content/themes/atahualpa/functions/bfa_header_config.php on line 297

The site is http://www.sextoninthecity.com

How do I correct this?

Thanks,
Elissa Sexton