Error Warning: require_once (system/codeigniter/CodeIgniter.php) failed to open stream: No such file or directory

[eluser]andygarcia[/eluser]
Just installed codeigniter but am getting this error

Warning: require_once(/public_html/ABC/system/codeigniter/CodeIgniter.php) [function.require-once]: failed to open stream: No such file or directory in /home1/App/public_html/ABC/system/index.php on line 115

Fatal error: require_once() [function.require]: Failed opening required '/public_html/abc/system/codeigniter/CodeIgniter.php' (include_path='.:/usr/lib64/php:/usr/lib/php') in /home1/App/public_html/ABC/index.php on line 115

115th Line says - require_once BASEPATH.'codeigniter/CodeIgniter'.EXT;

I browsed through this forum and did the following things,

a. Changed the system folder variable in index.php as below

$system_folder = "/public_html/ABC/system";

b. Changed the application folder variable in index.php as below

$application_folder = "/public_html/ABC/system/application";

c. Changed the permission of the entire codeigniter folder and its subfiles (5 files - codeigniter.php, common.php, compat.php, Base4.php, base5.php and index.htm)to 777

Still am getting the same error.

Could this be because the application asked me to create a database by the name action_abc but i created a database named App_abc because this is what my webserver allows me to create - it does not allow me to create action_abc as a sql database name. Could this be due to this? If yes - what could be the solution?

Can anyone help me why I am getting this error?

Guys... Thanks in advance...