I have checked the Server Folder. There is no admin folder. Why?

No admin folder required as it's route. Please check the documentation.pdf and search for 404 not found to get the suggestion.

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**Why am I getting 404 Not Found error after installation?**

Please

1. make sure that your apache `mod_rewite` is enabled
2. check that `.htaccess` file is successfully uploaded and exists in the main directory of SMA
3. `base_url` in `app/config/config.php`

If you are using godaddy, please visit the codeigniter official guide here. You might need to check and modify you .htaccess files too.

You can always check your error log to get more information about the issue.

I am in my windows testing server. Check all is right. but still can not work.

Once all fine, you won't get 404 error. Please double check above and make you apache server configured to use .htaccess from site folder.