Get_instance Does not work in Hosting

Hi, I'm using CI 3.1.0. I have made a Library. I used get_instance method in Library. It's Working fine in my local pc (xampp) But I'm getting blank page in My Hosting server. I can't figure it out.     Can anyone Help me, please?

Code:

   function __construct()
   {

       $this->CI =& get_instance();

       $this->CI->load->model('Soft_model');
}