Kohana 3.2 : Error reading session data - session

Question

I'm working on a module (a simple cms) with Kohana 3.2 and i'm getting this exception "Error reading session data."
I'm using native session and the funny thing is if i set a "default" group database connection the error isn't showed... (i'm using a custom connection group and i've set this database connection group to the user,role and user_token models).
here's my config file
auth.php
return array(
'driver' => 'orm',
'hash_method' => 'sha256',
'hash_key' => 'just a test 1',
'lifetime' => 1209600,
'session_type' => 'native',
'session_key' => 'just a test 2',
// Username/password combinations for the Auth File driver
'users' => array(
// 'luca' => 'e12afe0d3ead3d36191d86229d27057d96d9f2e063fe6f3e86699aaab5310d42'
// 'admin' => 'b3154acf3a344170077d11bdb5fff31532f679a1919e716a02',
),
);
session.php
return array(
'native' => array(
'name' => 'session_native',
'lifetime' => 43200,
),
'cookie' => array(
'name' => 'session_cookie',
'encrypted' => TRUE,
'lifetime' => 43200,
),
'database' => array(
'name' => 'session_database',
'encrypted' => TRUE,
'lifetime' => 43200,
'group' => Pencil::db_group(),
'table' => 'sessions',
'columns' => array(
'session_id' => 'session_id',
'last_active' => 'last_active',
'contents' => 'contents'
),
'gc' => 500,
),
);

Answer 1

You set encrypted to true, so you need an encrypt key. In your config/encrypt.php add this:
<?php
return array(
'default' => array(
'key' => 'MY_RANDOM_KEY_I_MADE_UP_ALL_BY_MYSELF',
),
);
I would keep session_key set to 'auth_user' instead of your random key as well. I think key in that circumstance is not the same as a hash key.
Check your logs in application/logs to see if anything else is missing.