Symfony Call to a member function get() on null -

i use symfony components in own framework. installed di component , tried in basecontroller time same error:

call member function get() on null

my base controller:

abstract class basecontroller implements containerawareinterface {     use containerawaretrait;     ... }

and when try access $this->container->get('ser_id'); return call member function.

how slove this?

update:

only work if include in controller service container

$this->service_container = include __dir__ .'/../../../container.php';

and use this:

$this->service_container->get('id');

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