deployment error

I have an application written in codeigniter 3.
I have developed it on localhost and i have tried to move it to a live server but it throws me a codeigniter 404 error.
It is not the .htaccess's fault since i have properly edited it.
I have no idea what causes this error.Please help me

If it is not .htaccess, then your filenames probably aren't capitalized properly. You can double-check the relevant portions of the user guide, but in most cases your class names and the files which contain them are supposed to start with a capital letter (generally with the rest in lowercase).

Bonfire

Practical CodeIgniter 3
CodeIgniter Testing Guide

Yes, read user guide carefully and check class filename:
https://github.com/kenjis/codeigniter3-filename-checker

ci-phpunit-test | CodeIgniter Testing Guide | CodeIgniter 3 to 4 Upgrade Helper

But is it possible to work on localhost and not on a live server?

You were right,thanks.
I have capitalized the libraries,the models and the controllers but the controllers fails to load a library(ion_auth)

But is it possible to work on localhost and not on a live server?

Yes, if you use Windows or Mac.
Because their file system is case insensitive.
But if your live server is Linux or BSD, probably your file system is case sensitive.

ci-phpunit-test | CodeIgniter Testing Guide | CodeIgniter 3 to 4 Upgrade Helper

You were right,thanks.
I have capitalized the libraries,the models and the controllers but the controllers fails to load a library(ion_auth)

You must fix the file names in ion_auth.
See https://github.com/benedmunds/CodeIgnite...patibility

ci-phpunit-test | CodeIgniter Testing Guide | CodeIgniter 3 to 4 Upgrade Helper

I have properly fixed the file names as in the docs,but it still fails to load..

I fixed it.My server was running PHP 5.2 and hence,bcrypt,the encryption library which ion_auth requires wasn't supported
I shall move my website to another server.
Thanks for your help