$this->session->sess_destroy(); error

What do you mean why not? You can't arbitrarily make-up a rule and then ask why it is not true.

- The documentation says it's loaded via $this->load->library() (and NOT $this->load->driver()).
- The database "library" also has drivers, and it's not loaded via $autoload['drivers'].
- The inline documentation (comments in the autoload.php file itself) above $autoload['drivers']) says "they extend the CI_Driver_Library class"; the Session library does not extend that class.

That last one has been explained in other topics around here too.

Narf, I was not making an arbitrary rule. I can't recall right now why, but I've been using it like that since version 3.0-dev...

The "why not" portion of my question must've been misinterpreted, or badly used by me on my sentence (and probably the bold part didn't helped either), but I was trying to learn about my mistake and asked simply for a better explanation other than a bold DO NOT DO THAT reply. I think that I have the right to be wrong but I appreciate that you (or anyone else) points when that happens. However if I don't ask why I'm wrong, then how am I supposed to learn from it?

Your explanation, although it answers my question, "sounds" a little too raw and a little mean (lacking a better word). Nevertheless, thank you for your response. I've updated my reply above so the user ignores it completely.

Best regards,
José Postiga
Senior Backend Developer