Method withCount does not exist

I am using laravel 5.4 so i'm trying to count number of relations between two models "Person" and "Permanance" so this is how it is called in my controller $persons = Person::all()->withCount('Permanance')->get(); and this is the error i'm getting

(1/1) BadMethodCallException

Method withCount does not exist. in Macroable.php line 74 at Collection->__call('withCount', array('Permanance'))in PermanancesController.php line 41

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