URL segment - User Profiles - Codeigniter

It's because the controller is looking for a function called ChrisSalij.

A few ways to solve this:

to be

function index($username){ $data['username'] =  $username;

and use the URL of mysite.com/user/index/ChrisSalij

if you don't like the idea of the index being in the URL you could change the function to be called a profile or the like, or look into using routing

and use something along the lines of

$route['user/(:any)'] = "user/index/$1";

to correctly map the URL of mysite.com/user/ChrisSalij

CodeHunter