MYSQL Code Appearing at bottom of admin - how do i solve?

http://www.am-accountants.co.uk

Hi,

I am getting some code coming in at the bottom of a site after a migration... see below

Warning: mysql_query(): Access denied for user ''@'localhost' (using password: NO) in /home/amaccountantsco/public_html/wp-content/plugins/wp-overview-lite/wp-overview-lite.php on line 95

Warning: mysql_query(): A link to the server could not be established in /home/amaccountantsco/public_html/wp-content/plugins/wp-overview-lite/wp-overview-lite.php on line 95

Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in /home/amaccountantsco/public_html/wp-content/plugins/wp-overview-lite/wp-overview-lite.php on line 95
db 1B ~ load 41.13 of 268435456M

How can i resolve this issue?