Problem with creating thumb image Codeigniter

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PHP

CodeIgniter

Hello! There is my function:

<? function resize_image($path, $path_image)
   {
       $CI = & get_instance();

       $config = array();

       $config['image_library'] = 'ImageMagick';
       $config['source_image'] = $path; //full path
       $config['new_image'] = $path_image.'new_image.jpg';
       $config['create_thumb'] = TRUE; // ставим флаг создания эскиза
       $config['maintain_ratio'] = TRUE; // сохранять пропорции
       $config['width']     = 200; // и задаем размеры
       $config['height']   = 200;

       $CI->load->library('image_lib');
       $CI->image_lib->initialize($config);

           if ( ! $CI->image_lib->resize())
           {
               echo $CI->image_lib->display_errors();
               die();
           }
           $CI->image_lib->clear();



   }?>

I try to make thumb image by library ImageMagick, but i get error:
The path to your image library is not correct. Please set the correct path in your image preferences.
How fix it?