custom login in laravel

I try to make custom login in laravel I got an error like ...

ErrorException in EloquentUserProvider.php line 116: Undefined index: password

my controller code ...

public function logincheck(Request $request)
    {
         $this->validate($request, [
        'Email' => 'required',
        'password' => 'required',
        ]);
         $email    = $request->Email;
         $password     =  md5($request->get('password'));
         if(Auth::attempt(['Email' => $request->get('Email'), 'Password' =>$password)]))
         {
            return ('ok');
         }
         return ('no');
    }

this is my blade file

<form role="form" action="" method="POST">
                            <fieldset>
                                <div class="row">
                                    <div class="col-sm-12 col-md-10  col-md-offset-1 ">
                                        <div class="form-group">
                                            <div class="input-group">
                                                <span class="input-group-addon">
                                                    <i class="glyphicon glyphicon-user"></i>
                                                </span> 
                                               <input class="form-control" placeholder="Email" name="Email" type="email" autofocus>
                                            </div>
                                        </div>
                                        <div class="form-group">
                                            <div class="input-group">
                                                <span class="input-group-addon">
                                                    <i class="glyphicon glyphicon-lock"></i>
                                                </span>
                                                <input class="form-control" placeholder="password" name="password" type="password" value="">
                                                <input type="hidden" name="_token" value="">
                                            </div>
                                        </div>
                                        <div class="form-group">
                                            <input type="submit" class="btn btn-lg btn-primary btn-block" value="Sign in">
                                        </div>
                                    </div>
                                </div>
                            </fieldset>
                        </form>

via Saran