Laravel Eloquent get count

I am trying to get result with the below query but I found error

$getAllRequirementRecord = Requirement::with('RequirementLocation')
           ->withCount('RequirementRecruiter')
           ->withcount('Interview.candidate')
           ->get()
           ->toArray();

Here is Error

Call to undefined method App\backend_model\Requirement\Requirement::Interview.candidate()

via Chebli Mohamed