Wordpress throwing header error wp- admin

Question

Here is an 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

How can I solve this error?

Answer 1

Open this file wp-content/plugins/QuoteForm/QuoteForm.php

and remove space from bottom line or start line of page.

Answer 2

Looks Like Extra White Space Added in your QuoteForm.php File or You are echoed something before Header

Please Refer Below Link for more details:
https://www.arclab.com/en/kb/php/php-warning-cannot-modify-header-information-headers-already-sent.html