Passing GET value show error

Code:

$this->load->view('documentazione/crea_documentazione_seconda/'

this line of code has missing ); on the end. I presume this is a typo in posting the question.

That message is just telling you that you are calling a controller with a missing argument.

You are calling somewhere this function:

PHP Code:

crea_documentazione_seconda($id) 


Without an id.

I do not know where you are doing this.

If I have misunderstood your problem I apologise in advance,

Paul

PS I find it useful to call my views and controllers things like:
Dashboard.php (controller)
dashboard_view.php (view file)
Dashboard_model.php (model file)
Dashboard_library.php (library file)
etc.