I Cant Read Session Data Other Controller

       
hello all use codeigniter with vue.js i create a session in controller session and i can read with defined name session datas but i cant read other pages 
i only call $this->session->userdata('user')

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try with $this->session->user;
works for me

Make sure you autoload the session library in application/config/autoload.php.
Read the documentation about session, because there are different ways to set it up.