Problem with view dir change

[eluser]walrus_lt[/eluser]
Hi, i have problem while trying to change view dir;
In my cron library i puted this code:

Code:

function check_browser(){
    $this->ci->load->library('user_agent');

    if ( $this->ci->agent->is_mobile() ){
        $this->ci->CI_Loader->_ci_view_path = APPPATH.'views/mobile/';
    } else {
        $this->ci->CI_Loader->_ci_view_path = APPPATH.'views/desktop/';
    }
}

But it throws error that it doesnt find my view file. Anyone could help me please?