Request URL 404 Amazon EC

Could someone kindly assist me with the following situation? I've been racking my brains for days and haven't found a solution.
I have been developing on localhost for the past couple of months, recently I uploaded my project to amazon EC, followed the same process as I did on my local installation but for some reason it keeps giving me error 404 if I try to access on of the routes.

This is my home page: http://dev.kosheradmin.com/ and it shows me the basic code igniter page.

And this is one of my routes: http://dev.kosheradmin.com/api/users 
And this is my .htaccess on public:

# Disable directory browsing
Options -Indexes

# ----------------------------------------------------------------------
# Rewrite engine
# ----------------------------------------------------------------------

# Turning on the rewrite engine is necessary for the following rules and features.
# FollowSymLinks must be enabled for this to work.
<IfModule mod_rewrite.c>
        Options +FollowSymlinks
        RewriteEngine On

        # If you installed CodeIgniter in a subfolder, you will need to
        # change the following line to match the subfolder you need.
        # http://httpd.apache.org/docs/current/mod...ewritebase
        # RewriteBase /

        # Redirect Trailing Slashes...
        RewriteCond %{REQUEST_FILENAME} !-d
        RewriteCond %{REQUEST_URI} (.+)/$
        RewriteRule ^ %1 [L,R=301]

        # Rewrite "www.example.com -> example.com"
        RewriteCond %{HTTPS} !=on
        RewriteCond %{HTTP_HOST} ^www\.(.+)$ [NC]
        RewriteRule ^ http://%1%{REQUEST_URI} [R=301,L]

        # Checks to see if the user is attempting to access a valid file,
        # such as an image or css document, if this isn't true it sends the
        # request to the front controller, index.php
        RewriteCond %{REQUEST_FILENAME} !-f
        RewriteCond %{REQUEST_FILENAME} !-d


       # Redirect Trailing Slashes...
        RewriteCond %{REQUEST_FILENAME} !-d
        RewriteCond %{REQUEST_URI} (.+)/$
        RewriteRule ^ %1 [L,R=301]

        # Rewrite "www.example.com -> example.com"
        RewriteCond %{HTTPS} !=on
        RewriteCond %{HTTP_HOST} ^www\.(.+)$ [NC]
        RewriteRule ^ http://%1%{REQUEST_URI} [R=301,L]

        # Checks to see if the user is attempting to access a valid file,
        # such as an image or css document, if this isn't true it sends the
        # request to the front controller, index.php
        RewriteCond %{REQUEST_FILENAME} !-f
        RewriteCond %{REQUEST_FILENAME} !-d
        RewriteRule ^([\s\S]*)$ index.php/$1 [L,NC,QSA]

        # Ensure Authorization header is passed along
        RewriteCond %{HTTP:Authorization} .
        RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
</IfModule>

<IfModule !mod_rewrite.c>
        # If we don't have mod_rewrite installed, all 404's
        # can be sent to index.php, and everything works as normal.
        ErrorDocument 404 index.php
</IfModule>

# Disable server signature start
        ServerSignature Off
# Disable server signature end