Cannot modify header information

I get “Warning: Cannot modify header information – headers already sent by (output started at /nfs/c09/h03/mnt/133445/domains/robeyl.com/html/wp-login.php:58) in /nfs/c09/h03/mnt/133445/domains/robeyl.com/html/wp-content/plugins/launchkey/launchkey.php on line 193
” on the login screen. between the Password box and the LaunchKey button.
The plug-In still works, just displays the error on the login page

https://www.ads-software.com/plugins/launchkey/