Codeigniter：将error_general.php错误重定向到控制器

I have error produced by application/views/errors/html/error_general.php

An Error Was Encountered

---

Unable to load the requested file: filename.php

But I want to redirect the error to my controller instead like in my error_general.php. Can I do something like?

if(substr($message,0,36) == "Unable to load the requested file")
{
    // redirect to my controller
    // $this->My_controller->my_method(); -i don't know what i'm doing here, lol
}

Or is there any way to do this?

create file core/MY_Exceptions.php

<?php
if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class MY_Exceptions extends Exception {

    public function __construct($message, $code = 0, Exception $previous = null) {
        parent::__construct($message, $code, $previous);
    }

    public function show_error($heading, $message, $template = 'error_general', $status_code = 500) {
        // do your work here
    }
}

refer codeigniter error handling guide for more help. codeigniter error handling