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Notice: Indirect modification of overloaded property Phalcon\Session\Adapter\Files::

I get this error when I upgraded my phalcon extension from 1.3.4 to 2.0.3

previously I had learnt that apart from the registerservice and register autoloaders part I don't have to change anything while migration between versions.

When i return my phalcon extension to 1.3.4 I don't get this error.

What could be the real cause?