I keep getting this error: "Call to a member function create() on null" in my controller. My $this->forum is null when i diedump it, and i have no idea why or how to fix it. I followed multiple tutorials on repository patterns, but keep ending up the same.

This is my directory structure: app/lib/Repositories/Forum/

My Controller:

<?php

use Repositories\Forum\ForumInterface;

class ForumController extends \BaseController {
    protected $forum;

    public function __constructor(ForumInterface $forum)
    {
        $this->forum = $forum;
    }

    ........

	public function store()
	{
        $input = Input::except('_token');

        $this->forum->create($input);

        return Redirect::route('dashboard');
	}

    .....

}

My Interface:

<?php namespace Repositories\Forum;

interface ForumInterface {

   ....

    public function create($input);

   ....

}

My repository:

<?php namespace Repositories\Forum;

use Forum;

class ForumRepository implements ForumInterface {

     .......

    public function create($input)
    {
        return Forum::create($input);
    }

    ......

}

ServiceProvider:

<?php namespace Repositories\Forum;

use Illuminate\Support\ServiceProvider;

class ForumServiceProvider extends ServiceProvider {

    public function register()
    {
        $this->app->bind(
            'Repositories\Forum\ForumInterface',
            'Repositories\Forum\ForumRepository'
        );
    }

}

What am i missing or doing wrong? Can anyone lead me in the right direction? Would really be appreciated, thank you!