Login Image Error Message

When I installed this plugin and uploaded an image everything works fine except two things:

1) When I hover over the image it shows this error message:

<b>Warning</b>: call_user_func_array() [
function.call-user-func-array]: First argument is expected to be a valid callback, 'login_headertitle' was given in <b>/home2/kennetk4/public_html/wp-includes/plugin.php</b> on line <b>166</b>
">NHC_Test_Environment

2) When I click the image it takes me to this web address: http://www.kennethbyrdjr.com/http://wordpress.org/

Which isn't validate and errors out.