Warning: Cannot modify header information - headers already sent by (output started at C:\wamp64\www\testing\addaddress.php:46) in C:\wamp64\www\testing\addaddress.php on line 77 code example

Example: Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\heermatka\myprofile.php:48) in C:\xampp\htdocs\heermatka\myprofile.php on line 144

ob_start();
Please paste top on the page.