Cannot redeclare __autoload()

[manishkumar-dsi]

Hi, I am using codeigniter version 2.2.1. I have followed the exact step for my project but it is giving PHP Fatal error: Cannot redeclare __autoload() . Please let me know what to do here. Thanks

Here is the stack trace :

PHP Fatal error:  Cannot redeclare __autoload() (previously declared in C:\inetpub\wwwroot\secure\server\application\config\config.php:423) in 
C:\inetpub\wwwroot\secure\server\application\config\config.php on line 432
PHP Stack trace:
PHP   1. {main}() D:\php5\phpunit.phar:0
PHP   2. PHPUnit_TextUI_Command::main() D:\php5\phpunit.phar:520
PHP   3. PHPUnit_TextUI_Command->run() phar://D:/php5/phpunit.phar/phpunit/TextUI/Command.php:109
PHP   4. PHPUnit_TextUI_Command->handleArguments() phar://D:/php5/phpunit.phar/phpunit/TextUI/Command.php:120
PHP   5. PHPUnit_TextUI_Command->handleBootstrap() phar://D:/php5/phpunit.phar/phpunit/TextUI/Command.php:681
PHP   6. PHPUnit_Util_Fileloader::checkAndLoad() phar://D:/php5/phpunit.phar/phpunit/TextUI/Command.php:804
PHP   7. PHPUnit_Util_Fileloader::load() phar://D:/php5/phpunit.phar/phpunit/Util/Fileloader.php:38
PHP   8. include_once() phar://D:/php5/phpunit.phar/phpunit/Util/Fileloader.php:56
PHP   9. require_once() C:\inetpub\wwwroot\secure\server\application\tests\bootstrap.php:27
PHP  10. require_once() C:\inetpub\wwwroot\secure\index.php:206
PHP  11. load_class() C:\inetpub\wwwroot\secure\server\system\core\CodeIgniter.php:116
PHP  12. config_item() C:\inetpub\wwwroot\secure\server\system\core\Common.php:151
PHP  13. get_config() C:\inetpub\wwwroot\secure\server\system\core\Common.php:276
PHP  14. require() C:\inetpub\wwwroot\secure\server\system\core\Common.php:235
PHP  15. _exception_handler() C:\inetpub\wwwroot\secure\server\system\core\Common.php:41
PHP  16. load_class() C:\inetpub\wwwroot\secure\server\system\core\Common.php:477
PHP  17. config_item() C:\inetpub\wwwroot\secure\server\system\core\Common.php:151
PHP  18. get_config() C:\inetpub\wwwroot\secure\server\system\core\Common.php:276