Wordpress throwing header error wp- admin

Here is the error

" Warning: Cannot modify header information - headers already sent by (output started at /Applications/MAMP/htdocs/webpresenter-Qa/wp-content/plugins/QuoteForm/QuoteForm.php:397) in /Applications/MAMP/htdocs/webpresenter-Qa/wp-includes/pluggable.php on line 1196"

Can anyone please help

via Chebli Mohamed