Are you using blade or regular html? If regular html you need this in your form:

<input type="hidden" name="_token" value="<?php echo csrf_token(); ?>">

If you are using blade it should work, double check your variable names etc.
Also see: http://laravel.io/forum/11-14-2014-laravel-5-cant-post

I believe the issue is actually in the controller as the form is validated and the postRegister method is called but that $user variable is not defined anywhere

Could you post here your form you're submitting?

Here's my view: (I modified the new default blade escaping syntax)

{{ Form::open() }}
    <!--Email Form Input-->
    <div class="form-group">
        {{ Form::label('email', 'Email:') }}
        {{ Form::email('email', null, ['class' => 'form-control']) }}
    </div>
    
    <!--Password Form Input-->
    <div class="form-group">
        {{ Form::label('password', 'Password:') }}
        {{ Form::password('password', ['class' => 'form-control']) }}
    </div>

    <!--Password Confirmation Form Input-->
    <div class="form-group">
        {{ Form::label('password_confirmation', 'Confirm Password:') }}
        {{ Form::password('password_confirmation', ['class' => 'form-control']) }}
    </div>
    
    <!--Register Form Input-->
    <div class="form-group">
        {{ Form::submit('Register', ['class' => 'btn btn-primary']) }}
    </div>
{{ Form::close() }}

Are you sure you are in laravel 5? Because l5 is needing this format in forms:

{!! Form::open(array('url' => 'loggin')) !!}

The {!! !!} to work. Or did you somehow get the

{{     }}

format working.

I get same error, I am now also working on this.

Yes, I reverted to the old syntax with:

 Blade::setEchoFormat('%s');

I ended up doing this, I use userid, you use email, so yours will be email:

public function postRegister(RegisterRequest $request)
       	{
		// Registration form is valid, create user...
                
             //$user = \App\User::create($request->all());
                $user = new \App\User(); 
                $user->userid = $request->input('userid');
                $user->password = \Illuminate\Support\Facades\Hash::make($request->input('password'));
                $user->save();

                $this->auth->login($user);

		return redirect('pets');  //or where ever here
	}

This worked

Thanks, I watched the Laracasts video but when implementing forgot all about manually creating the user. It's working now :)