You have specified an invalid database connection group codeigniter error

You are loading a database group called circrud. But there are no database group called that. The only one you have is a group called default which will be loaded by default if you don't specify a group.

$this->load->database('cicrud');

You should just do

$this->load->database(); in this part of the code:

class Users_model extends CI_Model {function __construct(){parent::__construct();$this->load->database();}

You are already using database group "cicrud" in your database connection here:

$this->load->database('cicrud');

So you can change it to:

$this->load->database();

Or you can change your config to this:

$db['cicrud']['hostname'] = 'localhost';$db['cicrud']['username'] = 'root';$db['cicrud']['password'] = '';$db['cicrud']['database'] = 'cicrud';$db['cicrud']['dbdriver'] = 'mysql';$db['cicrud']['dbprefix'] = '';$db['cicrud']['pconnect'] = TRUE;$db['cicrud']['db_debug'] = TRUE;$db['cicrud']['cache_on'] = FALSE;$db['cicrud']['cachedir'] = '';$db['cicrud']['char_set'] = 'utf8';$db['cicrud']['dbcollat'] = 'utf8_general_ci';$db['cicrud']['swap_pre'] = '';$db['cicrud']['autoinit'] = TRUE;$db['cicrud']['stricton'] = FALSE;

See what is better for you.

$autoload['libraries'] = array('database','session');

add this in config/autoload.phpthen

$this->load->database('databasename');

add this in model