Cannot modify header information

[eluser]Beginers[/eluser]

Code:

A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\offsrc\application\controllers\change_password.php:1)

Filename: core/Common.php

Line Number: 442
404 Page Not Found

The page you requested was not found.

Hi All,

i certainly encounter this error message always but then this one is tough enough that i could not figure out the root causes of this error. anyone here know this problem? Thank you.

Regards,
Beginners