Session library and unserialize() error.

[eluser]Twisted1919[/eluser]
Hi, I am using the 2.0 Reactor Version .
I am setting the session data like this:

Code:

$session_data=array(
'a'=>'b','c'=>'d','f'=>'g'
);
$this->session->set_userdata($session_data);

So there shouldn't be any error, but still it does.