Step 1:
Create a .htaccess file in the root directory of your project.
Step2:
Paste the following code to that file and save the file:
RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule .* index.php/$0 [PT,L]
Step 3:
Remove The .htaccess file from your project_name/application directory.
Finally you are done!