I just upgraded to 5.6.1.2 and I get this error at the top of the page.
Can anybody help me with why this is happening and how to resolve?
http://www.bocksplace.com

Events::extend('on_start', 'ThemeSwitcher', 'checkForIphone', 'libraries/theme_switcher.php');
Warning: Cannot modify header information - headers already sent by (output started at /home3/bockspla/public_html/bocksplace/config/site_events.php:1) in /home3/bockspla/public_html/bocksplace/updates/concrete5.6.1.2_updater/concrete/core/libraries/view.php on line 917