I know this issue have been discussed a number of times in this forum. also i have googled this for an hour. I have also followed instructions from WordPress Codex for Header Already Sent Warning.
But still i am unable to figure out the issue.
In my case error is in the line 1 of functions.php
output started at /home/wordpress/public_html/food/wp-content/themes/newtheme/functions.php:1
Can anyone here help me to figure out the issue.