Tried Moving to Root Directory – Error

I had my site on /blog and went through the instructions to move it to the root of the site. I am now receiving the following errors?

Please help!

Warning: array_keys() [function.array-keys]: The first argument should be an array in /nfs/c03/h03/mnt/54904/domains/benwoodwardmusic.com/html/wp-includes/widgets.php on line 1045

Warning: Cannot modify header information – headers already sent by (output started at /nfs/c03/h03/mnt/54904/domains/benwoodwardmusic.com/html/wp-includes/widgets.php:1045) in /nfs/c03/h03/mnt/54904/domains/benwoodwardmusic.com/html/wp-includes/pluggable.php on line 850