white screen after installing plugin

Hi - I am getting following error after installing a plugin. I have now removed the plugins by deleting the folder via FTP. However I am still getting the error. I get the error when logging into wordpress. PLEASE PLEASE help .... thanks "Warning: Cannot modify header information - headers already sent by (output started at /home/karigar0/public_html/successculture.com/wp-content/themes/adventurous/inc/adventurous-functions.php:1) in /home/karigar0/public_html/successculture.com/wp-includes/pluggable.php on line 1167"