Upgraded to 2.5: Can’t login

Hi,

I just upgraded to 2.5, However, When I tried to login, I saw the following message:

Warning: array_merge() [function.array-merge]: Argument #2 is not an array in /home/verotaro/public_html/motorparasi/wp-includes/widgets.php on line 60

Warning: Cannot modify header information – headers already sent by (output started at /home/verotaro/public_html/motorparasi/wp-includes/widgets.php:60) in /home/verotaro/public_html/motorparasi/wp-login.php on line 202

Warning: Cannot modify header information – headers already sent by (output started at /home/verotaro/public_html/motorparasi/wp-includes/widgets.php:60) in /home/verotaro/public_html/motorparasi/wp-login.php on line 214

Plus

Warning: Cannot modify header information – headers already sent by (output started at /home/verotaro/public_html/motorparasi/wp-includes/widgets.php:60) in /home/verotaro/public_html/motorparasi/wp-includes/pluggable.php on line 552

Warning: Cannot modify header information – headers already sent by (output started at /home/verotaro/public_html/motorparasi/wp-includes/widgets.php:60) in /home/verotaro/public_html/motorparasi/wp-includes/pluggable.php on line 689

Any help is appreciated.

Thanks