the clue to look for is in this part of the error message:
output started at /path/pagename.php:61
this is saying the problem is at line 60 or 60 (it usually reports 1 line after the problem) of the pagename.php page.
to be able to investigate the cause, I would need to see a copy of the page. If you could send a copy of the page, it would help us in trouble shooting.