autoload not working correctly

Welcome. I think I had found a bug in autoload. In the configuration I had added to autoload all needed libs (like by example "html", "url" with I needed).

After I wrote the code, I recieved error about call to unknown functions (with I got from the documentation for the html and url helpers). I solved it by typing on the code top:

Code:

$this->load->helper('html');
$this->load->helper('url');

This would mean that the autoloader don't work because before I entered the above code, the libs weren't automacially loaded as they should be.