I placed the `phpseclib` files in my `application/third_party` folder, I have included the path in my controller as shown below

```
set_include_path(get_include_path() . PATH_SEPARATOR . 'third_party/phpseclib/Net/SSH2.php'); 

```

But I cannot create an **instance** of that class. Getting an error as 

> 
> class ssh2 not found 
> 
> 
> 

What's the most appropriate way to use `phpseclib`?