Cannot modify header information error

[eluser]renju[/eluser]
Hi,
I'm using CI 2.0.1 with smarty as template engine.
I encountered an issue during initializing session.
Please help me to resolve the issue.

error message:

Message: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\donaldson_toolbox\application\libraries\smarty_parser.php:132)

Filename: libraries/Session.php

Line Number: 670

[eluser]bapobap[/eluser]
It means smarty_parser.php is trying to send output when it maybe shouldn't be.

Check for whitespace in the file or any echo, print_r function calls which might be causing it also, especially around line 132 of the smarty_parser.php file