CI2 to CI3 : error Call to a member function helper()

Hello, I have performed a migration in codeigniter version 2 to version 3,
I have a error in the logs :

Code:

Call to a member function helper() on a non-object in Session.php on line 76

I have consulted the link http://forum.codeigniter.com/thread-61901.html

But this has not helped me.


I need your help please

How did you "consult" it?

The very first reply (by me) to that thread contains the answer to your problem and the same thing is explained in the upgrade instructions, which you should've followed.