Missing argument 2 for Illuminate\Support\Collection::where() in Laravel 5.4

I'm building a small application in Laravel 5.4 where I'm having following query:

$user = User::find(1);
$tasks = $user->tasks;
$tasks->count = $tasks->count();
$tasks->completedCount = $tasks->where('status', '=', 'Closed')->count();
$tasks->investorCount = $tasks->where('task_id', '=', 'Investor Targets')->count();
$tasks->investorCompletedCount = $tasks->where([
    ['task_id', '=', 'Investor Targets'],
    ['status', '=', 'Closed'],
])->get()->count();
$tasks->researchCount = $tasks->where('task_id', '=', 'Research Targets')->count();
$tasks->researchCompletedCount = $tasks->where([
    ['task_id', '=', 'Research Targets'],
    ['status', '=', 'Closed'],
])->get()->count();
dd($tasks);

I'm getting following error;

Missing argument 2 for Illuminate\Support\Collection::where()

In the line

$tasks->investorCompletedCount = $tasks->where([
        ['task_id', '=', 'Investor Targets'],
        ['status', '=', 'Closed'],
    ])->get()->count();

My syntax is also correct, I don't know from where this problem is coming. Help me out in this.

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